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 4140-01-102-7798
NSN 6645-01-633-1852
NSN 7035-01-330-4799
NSN 5835-01-623-3328
NSN 5945-00-960-7367
NSN 6105-00-275-0826
NSN 5998-01-374-3111
NSN 6110-01-406-8517
NSN 5950-00-919-4546
NSN 5990-01-400-3299
NSN 6135-00-497-0491
NSN 5930-00-104-6148