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 6645-00-220-2458
NSN 6145-01-451-3490
NSN 5895-01-323-7418
NSN 5930-00-064-8015
NSN 5910-00-360-6268
NSN 5920-01-357-0997
NSN 6110-01-217-8817
NSN 6220-01-408-9129
NSN 4140-01-459-7411
NSN 6645-01-180-6219
NSN 6645-00-679-8203
NSN 5996-01-502-9215