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 5905-00-144-8471
NSN 6145-01-065-2692
NSN 6610-00-878-4634
NSN 5930-01-523-6934
NSN 5945-01-521-9598
NSN 5945-01-131-7591
NSN 5998-01-139-3234
NSN 5920-00-758-1348
NSN 6145-01-287-7688
NSN 7035-01-604-9813
NSN 5985-00-932-5333
NSN 5999-01-119-1532