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 6685-00-513-4971
NSN 5998-00-541-8792
NSN 6645-01-344-8702
NSN 5998-01-050-8908
NSN 5920-00-113-5215
NSN 6645-00-451-6462
NSN 5895-01-472-3541
NSN 5950-01-415-0276
NSN 5998-00-795-7644
NSN 5930-01-502-1561
NSN 5950-01-510-3802
NSN 6610-01-141-7014