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 4140-00-891-5407
NSN 5985-01-300-5627
NSN 5960-00-462-3393
NSN 5895-01-133-6600
NSN 5990-01-416-6009
NSN 2925-00-246-3077
NSN 5990-01-303-9920
NSN 5920-00-023-2926
NSN 5960-01-219-5504
NSN 5905-00-951-2817
NSN 6110-00-250-7913
NSN 5925-01-347-0358