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 5985-01-501-5411
NSN 5895-01-367-5343
NSN 6105-00-420-2335
NSN 2925-01-250-2731
NSN 5920-01-294-0405
NSN 5975-01-426-8968
NSN 5999-01-348-5717
NSN 5990-01-633-9503
NSN 5975-01-551-1172
NSN 5950-00-312-0649
NSN 4140-01-417-1850
NSN 6105-01-567-3217