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 5999-01-318-5451
NSN 5895-00-302-3896
NSN 4140-01-646-1853
NSN 2925-01-098-9549
NSN 5910-00-144-4383
NSN 6220-00-326-9144
NSN 6105-01-183-9116
NSN 6685-01-245-7956
NSN 6135-01-469-6429
NSN 6220-01-555-8332
NSN 6610-01-031-5672
NSN 7035-00-981-7216