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 6135-00-973-5632
NSN 5985-01-627-4149
NSN 5920-01-525-2229
NSN 6150-01-578-9664
NSN 7035-01-419-1462
NSN 6135-01-415-1163
NSN 5950-01-113-9065
NSN 5895-01-110-2353
NSN 5960-01-593-4760
NSN 4140-01-443-5866
NSN 6110-01-605-0883
NSN 5895-01-489-1428