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.
Classification: Military equipments not identified by kind
NSN 5910-01-141-5558
NSN 6685-01-146-6969
NSN 5999-01-212-3094
NSN 6130-01-629-4253
NSN 6650-00-399-2005
NSN 6135-01-422-1440
NSN 5920-00-291-1379
NSN 5999-01-068-3639
NSN 6130-00-935-5589
NSN 5999-01-298-5078
NSN 5996-00-665-2869
NSN 6240-01-269-1807