Difference between revisions of "CLAS12 R1"

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| Yes || glue applicator syringe ||400 || ||  Weller A10LL Air Operated Luer Lok Tip Syringes, 10CC, 15/Pkg
 
| Yes || glue applicator syringe ||400 || ||  Weller A10LL Air Operated Luer Lok Tip Syringes, 10CC, 15/Pkg
 
|-
 
|-
| Yes || glue applicator needle ||400 || ||  Grainger 18 and 20 GA with 1 inch cannula (Item #15VZV5 and #5FVH8)
+
| Yes || glue applicator needle || || ||  Grainger 18 and 20 GA with 1 inch cannula (Item #15VZV5 and #5FVH8)
 
|-
 
|-
 
| Yes || 1mm box chain || ? || ||  http://www.walmart.com/ip/1mm-Sterling-Silver-Diagonal-Box-Cut-Italian-Chain-Necklace-16/14892573
 
| Yes || 1mm box chain || ? || ||  http://www.walmart.com/ip/1mm-Sterling-Silver-Diagonal-Box-Cut-Italian-Chain-Necklace-16/14892573

Revision as of 23:56, 20 November 2012

04062012 TwoChambersInCleanRoom.png08172012 TheTeam.png

A10272011 CLAS12R1C1 Wires.jpgB10272011 CLAS12R1C1 Wires.jpg

The Field wires look like Idaho icicles when you turn off the lights to the clean room and shine a light through the entrance window

A11012011 CLAS12R1C1 Wires.jpgB11012011 CLAS12R1C1 Wires.jpgC11012011 CLAS12R1C1 Wires.jpgD11012011 CLAS12R1C1 Wires.jpgE11012011 CLAS12R1C1 Wires.jpg


Time line

Time needed to train lead stringer at JLab = 4-6 weeks?


Start Date End Date Actually End Date Description
5/17/10 9/30/10 8/6/10 Sign MOU
5/17/10 9/30/11 4/12/11 Contract recieved
8/3/2010 8/3/2010 8/18/2011 Readiness Review
9/1/10 10/29/10 6/16/2011 Hire and train R1 Lead Stringer
10/1/10 2/28/11 Hire and train 2 R1 stringers
11/16/09 11/30/10 Build R1 Cleanroom
11/5/2010 11/12/2011 8/16/2011 Ship 1st R1 Box From JLab to ISU
12/17/2010 2/28/2011 String First R1 Chambers
2/21/2011 3/31/2011 Ship remaining R1 Boxes From JLab to ISU
3/31/2011 1/25/2012 Fixture and 2 chambers arrive at ISU
7/13/12 Complete 6th R1 chamber
4/5/13 9/30/13 Ship chambers, fixtures, platforms and crane to JLab


Week Expected Date Actual Date Description
0 April 4, 2011 4/12/11 Issue Construction contract
4 May 2,2011 6/13/11 Hire lead stringer send to JLab for training
14 July 11, 2011 August 18, 2011 Clean room installed at ISU, Readiness Review, Hire 1st stringing team
Sept. 26, 2011 Begin stringing R1 chamber 2
Nov, 2011 Dec. 2, 2011 Finish guard and field wires on Region 1 Chamber 2
36 Dec. 12, 2011 Hire and begin training 2nd stringing team
40 Jan. 9, 2012 March 20, 2012 Begin stringing R1 Chamber 3
March 2, 2012 Jan. 23, 2012 Complete stringing R1 C2 Sector 1
March 14, 2012 Begin stringing R1 C4 Sector 5
45 March 20, 2012 Complete stringing and wire tests R1 C2
66 Aug 13, 2012 Complete Stringing and wire tests R1 C3
71 Sept 16, 2012 Complete Stringing and wire tests R1 C4
94 Feb 25, 2013 Complete Stringing and wire tests R1 C5
97 March 18, 2013 Complete Stringing and wire tests R1 C6
104 April 27, 2013 November, 2014 Ship chambers, fixtures, platforms and crane to JLab

4 ingredients to contract

1.) MOU: Memorandum of Understanding,

2.) SOW: Statement of Work

3.) Detailed Schedule

4.) Sole Source Justification

5.) Contact person: Pre Award Dave Harris? Approve Terms and conditions


University gets a Purchase Req: covers SOW, Terms & Condition, & Schedule.

We respond with proposal containing exceptions and work plan. 1 team of 2 stringers can do a wire in 6 minutes. Stringers spend 1/2 of their time stringing the rest of time preparing , Q&A, ... JLab expects a crew of 5 people. If we think we can't make the schedule we need to ask for more people. Stringers hourly rate ($30-$35/hr with overhead and benefits). Lead stringer is +$5/hr more.

Then they respond with contract.

"Cost Reimbursable" contract, University not liable if we go over budget


Can we survey to 50 microns? No. 200 microns.


Items From JLab
$2,500 Crane to mount DC (use grant to buy)
(Done) comes with stringing fixtures!. platform to take chamber from upper level to lower
JLab will order 2 Man Lifts to reach 15'
Primary magnets for wire tension measurements will be sent by JLab (We have budgeted for power supply get one that is 15 V, 100 amp Analog better than switching)


Task list

  1. Secure strip door
  2. Drill holes and Mount braces for seismic....geo....something requirements
  3. Make door for storage area under stairs
  4. Get 480 V outlets installed - Currently in progress. Estimated completion date: September 23, 2011.
  5. Order changing room items (bench, storage rack for clothes)
  6. Fix vinyl wall around fixture (need to install snaps)
  7. Mount power supply under fixture. Attach coil wires to power supplies (terminal ends for 1 gauge wire? maybe from an automotive store for battery cables)
  8. Find/build tray for manlift (1-2 feet wide , 6 inches deep) - Grainger part number: 2NXN5.
  9. Test stringing machine
  10. Door for entrance to clean room
  11. Cordless phone for cleanroom (call telecommunications 4541, 4900) Beam lab #2631
  12. Build adjustable pulley for bottom stringer
  13. Build chain weights for stringing
  14. Build tension weights
  15. Order torque wrench (in*lbs) – contact Steve Christo for part number. More than likely this is an expensive item, might cost $200-300 from Snap-On...maybe
  16. Order several power strips (min 3) - may need extension cords also
  17. Hard door for changing room

Order

  1. Scale - prefer digital that can measure to 1/10th gram. I put a link on the wiki page but I'm sure we can find this locally
  2. Dremel engraving bit
  3. Order snap fasteners ~100

Purchasing

Things we need to buy and when they need to be here

Equipment

Arrival Date Item to Purchase Sample Item Lead Time Budget Cost Done
6/10/11 Get Shipping Company for Clean room (??? Weight and Dimensions) quote from CleanAirQuote from shipper 1925 Yes
6/13/11 Get Mobile Crane Company for Clean room Unloading 1-2 days ? Yes
6/20/11 $2,500 Crane to mount DC (use grant to buy) Arnold Machinery 7-10 days 2882 Yes
6/20/11 Crane chain and chain hoists (use grant to buy) Empire Machinery 7-10 days 1155 Yes
8/1/11 Clean room Quality worktable ( ?? Quantity & Size) Stainless Steel Top Item 1521-55 1530 1198 Yes
8/1/11 2 Clean room Quality Storage Cabinet Acrylic Storage Cabinets 9011-07 2800 911x2 Yes
8/1/11 2 Clean room Quality Utility carts Utility Carts 1401-46 1200 599x2 Yes
8/1/11 4 Clean room Quality chairs Ergonomic Lab Chairs 2801-02 1 week 1000 366x4 Yes
8/1/11 1 Clean room Quality tool chest Craftsman 41" 11-Drawer SS Toolbox 1000 600 Yes
8/1/11 1 Clean room Quality and fire safe trash containers and bags Stainless Steel 24Gallon 1456-03 1 week 1000 550 Yes (need more bags)
8/1/11 Primary magnets power suppllies 40 V, 100 amp Analog better than switching Model REK 45-78 $8k 3000 Yes
8/1/11 Clean room Particle Counter Kanomax 3887 Handheld Laser Particle Counter. 0.3 - 5.0 microns, 3 Channels, 0.1 CFM. 3 days 2000 1875 Yes
8/1/11 CAEN N1471 http://www.caen.it/csite/CaenProd.jsp?showLicence=false&parent=1&idmod=622 6000 5,932 Yes
8/27/11 Bench Scale http://www.gramscales.com/product_info.php?cPath=25&products_id=338 1 week ? 45 Yes
1/6/12 [1] Bubbler [2] or [3] or [4] 10 days ordered Jan 4
1/6/12 Gas Flow Meter Tube E406 and HA valve or mixer AL end block Buna seals E401,E201,E910 tubes order part # MF3-6D201-E406-E201-E910 [math]6' \times 6' \times 1 ft^3[/math] No
10/15/12 Chain Bag Jett chain hoist JT-101706 Call Eric at 232-8302 (Industrial Tool & Supply)

Consumables

Need to Order? Item to Purchase Budget Cost Vendor
No Frocks 3000 www.wenvy.com, part number 21-639-S,M,L,XL
No Shoe cover 1000 Grainger From Norco its part #ENVV3100-UNIV (1 case of 150 , $0.19 each) (LDS account Z8342)
No head covers 1000 4953-85
Yes nitrile gloves (L, M) 27000 XLarge Large Medium small
Ordered 2 bags 4"x4" Lint free clean room wipes 4000 http://www.valutek.com/Cleanroom-Wipers/Cleanroom-Non-Woven-Wipers_2
Yes (get 20 pack with 30) tacky mats 1800 http://www.pro-tect.com/Pro-Tect-Catalog/Surface-Protection/Tacky-Mats.html
Yes(5) get handle and head 18" tacky roller with replacement heads (3" core) 500 http://www.cleanroomworld.com/category/index.cfm?cid=153&lvl=3 (no 3" replacement heads?)
Yes glue applicator syringe 400 Weller A10LL Air Operated Luer Lok Tip Syringes, 10CC, 15/Pkg
Yes glue applicator needle Grainger 18 and 20 GA with 1 inch cannula (Item #15VZV5 and #5FVH8)
Yes 1mm box chain ? http://www.walmart.com/ip/1mm-Sterling-Silver-Diagonal-Box-Cut-Italian-Chain-Necklace-16/14892573
Yes Epon 829 Resin (3 year shelf life) 1300 E.V. Roberts, 18027 Bishop Avenue, Carson, CA 90746-4019, United States, Phone +1 310-204-6159, Toll Free: +1 800-374-3872, Fax: +1 310-202-7247, http://www.evroberts.com/
Yes Versamid 140 Hardener (?? shelf life) 800
Yes Staticide - anti-static cleaner ? http://www.aclstaticide.com/01/index.html
Yes 0.001" Aluminized Mylar 2640 150 ft Sheldahl Inc at 1-507-663-8000, part# 146468 (width of 48")
Yes Foam Rubber Gasket ? http://www.mcmaster.com/#93625k54/=eqcihp
? HVTB -> ADB Round-to-Flat Signal Cable ? 252.23 + S&H Mouser


http://www.mouser.com/ProductDetail/Amphenol-Spectra-Strip/169-2832-034/?qs=sGAEpiMZZMsJiFh04Lj2rryUPLqBgDClQGXI9Q%252bWsaI%3d
Mouser Part #: 523-169-2832-034
Manufacturer Part #: 169-2832-034
Manufacturer: Amphenol Spectra-Strip

ISU Clean Room Facility

The chamber's longest wire should be lifted 4 ft off the floor.
Need a hand rail system so people don't fall off the ledge because they mistake the clean room wall for a solid structure.

File:BasementRenovationDrawing 6-16-10.pdf

File:BasementRenovationDrawing 6-28-10.pdf Changes to machine shop door

File:BasementRenovationDrawing 7-26-10.pdf Maybe the Final design with 8' hallways and 8' doors to the clean room


Media:Series575_CleanRoom_InstallManual.pdf

 Ed cash : 242-8192 (manages electricians, call to be sure work order is in place for )

CLAS 10,000

Definition

Class maximum particles/m³ FED STD 209E
equivalent
≥0.1 µm ≥0.2 µm ≥0.3 µm ≥0.5 µm ≥1 µm ≥5 µm
ISO 7       352,000 83,200 2,930 Class 10,000
ISO 9       35,200,000 8,320,000 293,000 Room air

ISU Clean room Environment monitors

Temperature

Temp1 == Top of clean room middle.

Temp2 == South wall bottom

Temp3 == South wall top


http://hal.iac.isu.edu/cacti-graphs/graph_6.html

The ISU clean rooom is 20' x 21' x 15' = 6300 ft^3 = 178 m^3

PhysicsCleanRoomParticleCountLog

Clean_Room_Particle_Counter_User_Directions

Construction Quotes

We are currently waiting on quotes from the following companies on the construction of the Clean Room (both specs) at ISU. They are Modular Clean Rooms and Clean Air Products. Once quotes are received, pdf's of the quotes will be uploaded online.


2010 July 14

Quote from Clean Air Products for the ISU Basement:


Latest quote

File:Clean Air Quote 4-27-11.pdf

File:Clean Air Quote 10-15-10.pdfFile:Clean Air FilterQuote 10-15-10.pdf

File:Clean Air FilterDescript 10-15-10.pdf

File:Clean Air Quote.pdf

Clean Air Room 01.png Clean Air Room 02.png

File:Clean Air Quote No Filters.pdf

Dimensions of door from loading dock to clean room
65" wide
90" high

The doors into and out of the different areas will be 9'8" high in order to help facilitate the transport of equipment into and out of the different areas of the clean room.

The desks in the clean room will act as a table top area to place tools and other equipment currently in use during the construction of the wire chambers. Also, they will serve as a place to perform any calculations or other miscellaneous work that may come up while construction is ongoing.

The cabinets on the other side of the room will be a permanent storage area for all tools and equipment not currently in use at the two work stations.

The path in between the workstations and the cabinets will be kept clear of all obstructions in order facilitate the movement of equipment into and out of the room as needed.

The two workstations will be where the wire chambers are constructed. The workstations will have a standing/sitting apparatus built around them in order to help those who are stringing the wire chambers to have better access to the chambers from above. Schematics for these will be uploaded as they are designed.

The heavy equipment storage area will be where all the heavier equipment (i.e. dollies, fabrication materials, etc...) that will not fit, or does not need to be stored in the individual work station cabinets will be kept.


The HEPA filters will cover roughly ~10-12% of the ceiling in order to maintain a Class 10,000 environment. The filters will move approximately 35-40 air volumes per hour.

Overhead lighting will be suspended from the frame in order to provide sufficient lighting for the room occupants to work within.


Floor paint

File:ArmoSeal1000epoxypaint.pdf

Pictures of Path from Dock to clean room

As measured on the spit in the JLab clean room on April 28, 2011. The narrowest part of the R1 detector was 78". A door should accomodate 78" + box.

The Tip of the stringing fixture was 13' 5" high from the floor.


Below are pictures showing how our R1 mock up, an equilateral triangle 8' on the side, passes from the loading dock to the clean room area.

ISU Physics LoadingDock W 3-30-11.jpg ISU Physics LoadingDock H 3-30-11.jpg
The 8' wide mock up is a few inches larger than the loading dock door. The mock up is just able to pass through the door when standing up.


The R1 chambers will pass through 2 newly cut doorways to the clean room

ISU Physics CleanRoomD1 W 3-30-11.jpg ISU Physics CleanRoomD2 3-30-11.jpg
The 8' wide mock has several inches to spare going through the first doorway. The second doorway is the same width as the first.


    • Photos courtesy of Dr. Philip Cole

Pictures of the ISU Squash Court

ISU Basement 01.jpg ISU Basement 02.jpg ISU Basement 03.jpg ISU Basement 04.jpg

ISU Basement 05.jpg ISU Basement 06.jpg ISU Basement 07.jpg ISU Basement 08.jpg

ISU Basement 09.jpg ISU Basement 10.jpg ISU Basement 11.jpg ISU Basement 12.jpg

ISU Basement 13.jpg

6/18/09

The clean room needs space for instrumenting.  The DC will be layed horizontal so PC cards can be mounted and tested.

ODU's Clean Room

ODU's current clean room size:

20 ' high
20 ' Width
40 ' Length

CLAS 10,00 clean rooms


File:ODU CleanRoomDesign.pdf

Environmental control needed

Temperature control constraint is [math]\pm 2\% :\frac{7\% \;\;change\;\;in \;\;tension}{6 \;\;Degree \;\; Farenheit}[/math]

The wire tension can fluctuate no more than 5% from the mean wire tension specification.

This means that the temperature should be controlled to within +/- 2 Degrees Ferenheit

Humidity control: 55 % or less


File:KashyHallBTempReport 2-09.docFile:KashyHallBTempReport 2-09.pdf


Online Room Temp monitors

http://hal.iac.isu.edu/cacti-graphs/graph_6.html

HVAC performance June 2011

The HVAC system has been repaired. It was set to a temperature of 66 +/- 2 degree F. I saw the cooling light turn on at least once. On June 21,2011 the set point was changed from 66 to 72.

HVAC 4weekTempStability 4-11.png

Below is a snapshot after I turned the set point from 66 to 72. It looks like the cycle time was about 20 minutes when set to 66 degrees and 2 degree stability.

HVAC Heating 4-21-11.png

The temperatures measured after changing the temperature set point to 72.

HVAC Heating 4-22-11.png


Temperature Oscillations observed before adding a tarp over the large doorway

HVAC Oscilation 4-22-11.png

Some IAC personnel moved the tarp for a little while at time index 18:40. Fortunately there will be 2 doors put in. One where the tarp is now and another 5 feet towards the basement exit. Otherwise, I would worry about the impact of opening the large door on stringing.

HVAC TarpOpened 4-22-11.png

The temperature seems to be more stable now with the tarp over the doorway, allowing the HVAC to control the temperature in only the clean room area. Below is a graph of the temperature in the room over a 6 hour period starting at 8 am until 2 pm on June 24, 2011.

HVAC WithTarp 4-23-11.png

Below is a plot of the temperatures recorded over the last 7 days (4/18 - 24 / 11) when all the changes were happening to try and bring the temperature up to 72 degrees.

HVAC TempLog 4-28-24-11.png

Below is a plot of the temperatures recorded over the last 7 days (4/21 - 27 / 11) . There appears to be a slow rise?

HVAC TempLog 4-27-11.png

6/28/11

I went down to the clean room and and saw that the Duct work was started. There are open holes into the adjacent room right now which need to be closed up.

I also saw that the set point has been raise to 73 degrees. This explains the temperature rise above.
8/11/11

Began moving the temperature sensors to new locations in the clean room. We plan on mounting them at locations which will measure the stringing temperature at the top and bottom of a chamber while we are stringing the chamber

HVAC TempLog 8-12-11.png

8/24/11

Installed an air deflector on the 5th vent furthest from the HVAC unit at approximately 11:30 AM, fourth vent furthest at ~3:00 PM, and 3rd vent at 3:15 PM.

July 2011 HVAC performance

6/6/11

Construction begins in the clean room. I opened the tarp over our big door a little bit and now I see temperature oscillations again.

HVAC TempLog 6-6-11.png

6/7/11

The first few days of July were stable but there was a positive temperature gradient slowly increasing the temperature about +1/3 degree F per day. Then on July 4 something caused temperatures to fluctuate at least 1 degree within a day. Could it be that the university turned off the AC over the weekend and there was a delay seeing the building aclimate?

HVAC TempLog 6-7-11.png


Sept 11 power outage recovery

HVAC TempLog 9-11-11.png

Cleaning Procedures

R1 Construction preparations

Wire Tension

A Helmholtz coil is used to test the wire tension

CLAS6 R1 wire tension measurement technique NIM article

File:CLAS6 DCWireTensMeasTech 1996.pdf

Below is a write up from BaBar

File:Device2MeasureWireTension Covery BaBarReportTNDC-96-39 1996.pdf

File:ODU WireTensionMeasurements 10-2009.pdf

An excel spreadsheet to calculate fields for such coils is given at

http://clasweb.jlab.org/drawings/CLAS12/DRIFT_CHAMBERS/Helmholz_calculator.xls

The formula is from Physics 10X but more importantly it contains wire parameters useful for the calculation

Discussion items

1.) Budget

  • JLab to ISU travel for JLab personnel to inspect operations
  • shipping container for R1 chambers

2.) Clean room

cost =

assume we copy the ODU clean room

Using IAC conference room space, need to remove carpet and paint floor.


3.) hiring timeline

9/08 NSF proposal submission

4.) stringing platform and DC stringing support arm

5.) Manpower

6.) MOU to support post doc request or faculty release time

7.) Stringing equipment

a.) crimping tool

b.) glue

c.) wire or feedthroughs?

d.) wire tension measurement (PC, Magnets, associated electronics



A few pictures ff the R1 full size proto type from my JLab visit on 9/16/07. It is about 6 feet tall. CLAS12_R1_Prototype_9-16-07

The air actuated crimping tool:

Air Actuated R1 CrimpingTool.jpg

Construction First R1 Chamber at JLab

As measured on the spit in the JLab clean room on April 28, 2011. The narrowest part of the R1 detector was 78". A door should accomodate 78" + box.

The Tip of the stringing fixture was 13' 5" high from the floor.


R1CH1 4-28-2011 1.jpg R1CH1 4-28-2011 2.jpg
R1CH1 4-28-2011 3.jpg R1CH1 4-28-2011 4.jpg
R1CH1 4-28-2011 5.jpg R1CH1 4-28-2011 6.jpg

R1 Procedures & Drawings

JLab Drawing repository

https://userweb.jlab.org/~aellis/R1_Fixture/

R1 Fixture Procedures

File:CLAS12 R1 FixturProcedures.doc

Referenced drawings

File:Sheet1 B00000-07-04-3200.pdfFile:Sheet2 B00000-07-04-3200.pdfFile:Sheet3 B00000-07-04-3200.pdf

File:B00000-07-04-4400.pdf

Stringing Manual

Stringing Manual

Media:R1_CLAS12_StringingManual_2008.doc Media:R1_CLAS12_StringingManual_2008.pdf


File:2012CLAS12R1AmmendedStringingManual.pdf

http://www.jlab.org/~jacobsg/

Gas flow operation

Standard operating pressure is 0.05" inches of water.

the bubbler exhaust tip should barely touch the oil enough to cause bubbles.


http://clasweb.jlab.org/drawings/CLAS12/DRIFT_CHAMBERS/R1_Chamber_Assembly_Procedure.doc

http://clasweb.jlab.org/drawings/CLAS12/DRIFT_CHAMBERS/R1_End_Plate_Assembly_Procedure_RevA.doc

CLAS12 R1 SOW

CLAS12_R1_SOW


Readiness Review

CLAS12R1ReadinessReview2011

CLAS12_R1_Progress_Reports

CLAS12_R1_Progress_Reports


CLAS12_R1_Prototype_2-20-08

Region 1 Q &A

Cosmic Test Stand

CLAS12R1_CosmicTestStand

R1S1

CLAS12_R1_S1_QA


R1S6

CLAS12_R1_S6_QA

Vendors

http://www.cleanairproducts.com/

References

JLab job posting for lead stringer

add should be available at

https://isujobs.net/applicants/jsp/shared/Welcome_css.jsp

CLAS Wire Chamber Technician

Requisition Number	 10534
Job Category	Technician/Drafter
Percentage of Travel	No Travel
Job Responsibilities	(TERM POSITION ENDING TWO YEARS FROM HIRE DATE)

DATE POSTED: FEBRUARY 11, 2010

SALARY RANGE: $45,500 - $61,900 (TD II)

DUTIES: Technician will be responsible for the fabrication of very large and very precise particle detection units called "wire chambers" in support of the CLAS 12 GEV project. These "wire chambers" will be built in a clean room by teams. Incumbent is expected to lead these fabrication teams. Specifically, individual will be responsible for leading a team in building these detectors and maintaining strict quality controls. Will be required to learn all aspects of detector fabrication, stringing and testing. Will fabricate and string the detectors maintaining high precision and quality. Will receive, clean and inspect parts for compliance with technical specifications.

Experience/Education Required	MINIMUM QUALIFICATIONS:

Associates Degree plus 3 years of applicable experience or equivalent combination of education and relevant experience. Knowledge of basic electricity and/or electronics required. Knowledge and experience in the proper use of hand and power tools as well as ability to follow written procedures in operating and technical manuals also required. Basic computer skills such as Excel and/or CAD experience is a plus. Ability to work in a team environment. A background in quality control as well as experience supervising and motivating others in a team setting preferred.

Physical Requirements: - Pass all medical requirements for the following qualifications: Rad Worker, ODH, Crane Operator, Forklift Operator, Aerial Platform Operator, etc. - Cannot have a fear of heights or confined spaces. - Must be able to climb stairs, ladders, vertical escape ladders and work in close quarters with others. - Steady hands and eyes for delicate close-up work.


During interview have them try to crimp a wire.


Master rigger, to manipulate the chamber onto the stringing platform.  

Master rigger class at JLab on November 2-4, 2010. Overhead training class pre-req. contact kelley

Overhead crane class,


TimeCLAS12R1_LeadStringer2


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