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 5950-01-535-7015
NSN 6685-00-883-4608
NSN 6610-01-152-2821
NSN 5996-00-814-5309
NSN 5915-00-036-9529
NSN 5915-00-987-7165
NSN 5965-01-272-3480
NSN 5998-01-387-2972
NSN 6620-01-197-0386
NSN 5920-01-213-7276
NSN 5998-01-410-7660
NSN 5835-01-133-6485