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		                        | National Stock Number:
 1240-00-544-4920
 
 Federal Supply Class:
 1240
 
 National Item Identification Number:
 005444920
 
 Description:
 WINDOW,OPTICAL INSTRUMENT
 
 Detail:
 A COLOR FREE ITEM OF TRANSPARENT OR TRANSLUCENT MATERIAL, USUALLY OPTICAL GLASS, HAVING SPECIFIC LIGHT DISPERSIVE AND REFRACTIVE PROPERTIES. THIS ITEM MUST HAVE TWO PLANE-PARALLEL SURFACES AND IS DESIGNED FOR USE IN AN OPTICAL INSTRUMENT TO PROVIDE A BARRIER TO FOREIGN MATTER AND/OR PERMIT LIGHT TRANSMISSION IN OR TO THE OPTICAL SYSTEM.
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 Manufacturer Information:
 
 | 710-1317 | 16735 | CORNING OCA CORP | 
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 Techincal Specification:
 
 | DIAMETER | 1.098 INCHES NOMINAL |  | MATERIAL | GLASS LOCATION NOT OTHERWISE SPECIFIED |  | POLISHED PERIPHERY | NOT PROVIDED |  | REFLECTION REDUCING SURFACE | BOTH |  | THICKNESS | 0.100 INCHES NOMINAL | 
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