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		                        | National Stock Number:
 1240-00-451-8174
 
 Federal Supply Class:
 1240
 
 National Item Identification Number:
 004518174
 
 Description:
 PRISM,OPTICAL INSTRUMENT
 
 Detail:
 A TRANSPARENT ITEM WITH AT LEAST TWO POLISHED PLANE SURFACES INCLINED TOWARD EACH OTHER, DESIGNED FOR USE IN OPTICAL INSTRUMENTS TO REFLECT AND/OR REFRACT A BEAM OF LIGHT. IT MAY HAVE ONE OR MORE MIRRORED SURFACES FOR GREATER REFLECTION. INCLUDES OPTICAL WEDGES USED TO DIVERT PATHS OF LIGHT BY REFRACTION, BUT TO A LESSER DEGREE. SEE ALSO BEAM SPLITTER, OPTICAL INSTRUMENT.
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 Manufacturer Information:
 
 | 1240004518174 | SCY13 | E.C.A ETABLISSEMENT CENTRALD'APPROVISIONNEMENT DES FORCES ARMEE |  | 7688709 | 19200 | US ARMY ARDEC RDECOM | 
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 Techincal Specification:
 
 | FSC APPLICATION DATA | PERISCOPE,TANK |  | LIGHT DEVIATION | 90 DEG |  | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, CLASS 1, GRADE C, TYPE 523-586 MIL SPEC SINGLE MATERIAL RESPONSE |  | MATERIAL | GLASS OPTICAL |  | STYLE DESIGNATOR | ROOF-ANGLE | 
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