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 4140-01-116-3138
NSN 6240-01-335-7727
NSN 5855-00-256-5562
NSN 6145-01-166-3714
NSN 6620-01-447-1913
NSN 6220-01-425-1588
NSN 5935-01-030-3325
NSN 5999-00-992-7182
NSN 5855-01-350-5540
NSN 5950-01-088-6381
NSN 5925-01-559-2836
NSN 6610-00-005-4452