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 6240-01-246-4258
NSN 5895-00-857-6783
NSN 5999-01-214-2569
NSN 5996-01-273-3934
NSN 4140-00-408-9989
NSN 5975-00-567-2766
NSN 5975-01-305-4190
NSN 6650-00-187-5388
NSN 5920-01-581-9887
NSN 5998-01-324-3357
NSN 6240-01-217-8287
NSN 6685-01-505-0892