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 6685-01-498-1419
NSN 6145-01-387-6221
NSN 6685-01-487-3799
NSN 5920-01-139-5137
NSN 5925-00-504-5364
NSN 4140-01-289-5999
NSN 5855-00-177-3529
NSN 5895-01-605-2596
NSN 5905-01-438-5571
NSN 5915-00-518-4656
NSN 5925-01-234-8312
NSN 5975-01-581-5826