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 5996-01-261-6758
NSN 5920-01-343-9260
NSN 5999-01-169-6052
NSN 5855-01-144-4837
NSN 6610-01-433-2219
NSN 6135-00-990-1822
NSN 5930-00-335-7301
NSN 4140-00-555-3251
NSN 6145-01-369-4001
NSN 5895-01-030-7439
NSN 6145-01-467-2681
NSN 5915-01-350-2037