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 6650-00-590-9073
NSN 6320-01-540-4885
NSN 5960-01-425-1454
NSN 5855-01-020-7982
NSN 4140-00-365-2531
NSN 5910-00-495-4884
NSN 6685-01-215-8125
NSN 6135-00-900-2139
NSN 5925-01-409-2616
NSN 7035-01-453-4242
NSN 5999-01-143-3633
NSN 6610-00-259-2992