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 6150-00-596-9882
NSN 4140-01-044-5118
NSN 5950-00-766-4821
NSN 6685-00-510-2905
NSN 6135-00-451-0709
NSN 6240-00-807-2508
NSN 6685-00-663-9000
NSN 6685-00-453-0178
NSN 5999-01-177-6380
NSN 6645-01-513-4782
NSN 6620-00-530-1370
NSN 6220-01-167-7859