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		                             National Stock Number: 9330-00-455-0564
  Federal Supply Class: 9330
  National Item Identification Number: 004550564
  Description: WINDOW,OBSERVATION
  Detail: A TRANSPARENT ITEM OF A PREDETERMINED SIZE THAT PERMITS UNOBSTRUCTED AND UNDISTORTED VIEW OF A DESIRED AREA. IT MAY INCLUDE A FRAME, HAVE REFERENCE MARKINGS, GRID LINES AND MAY BE HEAT STRENGTHENED AND/OR TINTED. IT IS GENERALLY USED WHERE SAFETY, SECURITY, AND/OR THE RESTRICTION OF FOREIGN MATTER ARE REQUIRED, SUCH AS THE VISUAL EXAMINATION OF THE INSIDE OF PRESSURIZED TANKS, LIQUID SIGHTS, CONTROLLED LIQUID FLOW, AND INSPECTION OF EQUIPMENT ENCLOSED IN A HOUSING. SEE WINDOW (AS MODIFIED); SCALE, CATHODE RAY TUBE; SCALE, PLOTTING; WINDOW, METAL; WINDOW, WOOD; AND WINDOW PANEL, AIRCRAFT.
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  Manufacturer Information:
 | 21-193324-01 | 11530 | LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN INFORMATION SYSTEMS & GLOBAL SOLUTIONS |  | 21-193324-01 | 29556 | POLAROID CORPORATION DBA POLAROID |  | 21-193324-01 | 60854 | LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN INFORMATION SYSTEMS & GLOBAL SOLUTIONS |   
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  Techincal Specification:
 | FSC APPLICATION DATA | WINDOW,CATHODE RAY TUBE,TEST,EXCEPT SPECIALLY DESIGNED |  | MATERIAL TRANSPARENCY | CLEAR |  | MATERIAL | PLASTIC |  | PLY QUANTITY | 2 |  | OVERALL DIAMETER | 15.160 INCHES NOMINAL |  | OVERALL THICKNESS | 0.107 INCHES MINIMUM AND 0.157 INCHES MAXIMUM |  | STYLE DESIGNATOR | CIRCULAR |   
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