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 5960-01-138-5897
NSN 6610-01-412-4427
NSN 5925-01-370-4417
NSN 5996-01-097-0778
NSN 5990-01-050-7535
NSN 5990-01-387-6114
NSN 6240-01-633-9357
NSN 6110-01-068-3982
NSN 5935-01-423-4704
NSN 5895-01-204-8433
NSN 7035-01-136-3618
NSN 6620-01-454-8926