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 5920-00-184-2058
NSN 5965-01-592-0153
NSN 5925-01-144-3137
NSN 6610-01-615-9861
NSN 6220-01-440-4784
NSN 5915-01-525-7731
NSN 6130-01-134-9689
NSN 6105-01-158-7032
NSN 5945-01-139-4260
NSN 6105-00-523-0403
NSN 6150-00-719-6119
NSN 5998-01-391-0691