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 6320-01-422-1212
NSN 5920-00-655-4251
NSN 5905-00-583-1901
NSN 5910-01-039-7191
NSN 5835-00-247-0161
NSN 6135-01-193-3892
NSN 5999-01-062-0739
NSN 6650-01-172-7864
NSN 5905-00-915-5839
NSN 6685-00-379-4652
NSN 6145-01-099-9114
NSN 5905-01-439-0771