A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 4140-01-587-5770
NSN 5895-00-187-2850
NSN 5998-00-206-6613
NSN 6105-00-494-8276
NSN 5996-01-423-8452
NSN 6645-01-397-7277
NSN 5920-00-400-6227
NSN 7035-01-076-4067
NSN 5920-00-018-1452
NSN 5935-01-113-4492
NSN 6105-01-410-8948
NSN 6620-01-064-0366