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 5965-01-101-2187
NSN 5910-01-536-9965
NSN 6685-01-198-5776
NSN 5935-01-260-8078
NSN 5998-00-357-1383
NSN 5925-00-407-7660
NSN 6685-01-027-2594
NSN 5975-00-655-4103
NSN 4140-00-219-3146
NSN 6105-01-585-8381
NSN 5999-01-297-8616
NSN 6240-01-071-2127