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		                        | National Stock Number:
 9330-01-079-1991
 
 Federal Supply Class:
 9330
 
 National Item Identification Number:
 010791991
 
 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:
 
 | 015508 | 45436 | PILKINGTON OPTRNICS INCRPRTION |  | 015508 | K6111 | QIOPTIQ LIMITED | 
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 Techincal Specification:
 
 | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-P-5425 MIL SPEC SINGLE MATERIAL RESPONSE |  | MATERIAL TRANSPARENCY | CLEAR |  | MATERIAL | PLASTIC |  | MINIMUM TENSILE STRENGTH | 8000 POUNDS PER SQUARE INCH |  | OVERALL DIAMETER | 1.310 INCHES NOMINAL |  | OVERALL THICKNESS | 0.230 INCHES NOMINAL |  | STYLE DESIGNATOR | CIRCULAR | 
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