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 4140-01-411-5908
NSN 6150-00-841-6629
NSN 6130-01-225-8530
NSN 5920-01-349-0012
NSN 6135-01-136-8306
NSN 5835-01-026-6006
NSN 5935-01-167-7790
NSN 5920-00-412-4813
NSN 5985-01-183-8037
NSN 5950-01-592-6725
NSN 6320-01-225-9963
NSN 6220-00-218-0857