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 4140-01-344-4961
NSN 6135-01-231-4809
NSN 5996-01-515-6895
NSN 7035-00-173-2281
NSN 6130-00-661-0197
NSN 6130-01-025-1540
NSN 5935-01-608-2525
NSN 6130-00-561-3222
NSN 6610-01-448-4989
NSN 5990-01-452-0911
NSN 5925-00-961-9179
NSN 5950-01-354-7553