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 5960-01-500-6615
NSN 6105-00-395-7045
NSN 7035-01-425-8063
NSN 5985-01-530-5992
NSN 2925-01-482-8202
NSN 5998-00-732-0492
NSN 5960-00-382-6012
NSN 5998-00-221-3216
NSN 5998-01-220-5455
NSN 2925-01-140-1015
NSN 5945-01-433-3390
NSN 5960-01-632-6576