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 4140-00-786-7377
NSN 5999-01-374-6030
NSN 6620-00-445-5573
NSN 5835-01-171-9126
NSN 5855-01-500-6617
NSN 4140-00-402-6362
NSN 5985-01-441-1922
NSN 5990-01-606-9305
NSN 5915-01-621-3273
NSN 6220-00-964-1042
NSN 6220-01-581-0987
NSN 6685-01-224-6405