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 5835-00-649-9402
NSN 5975-00-435-7065
NSN 2925-00-295-8109
NSN 5985-00-279-8507
NSN 5965-00-524-3402
NSN 5910-01-372-4527
NSN 5905-01-092-8426
NSN 5996-00-299-1609
NSN 5998-01-185-9335
NSN 5996-01-513-9656
NSN 6645-00-959-6502
NSN 5920-01-063-4368