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 5910-01-432-0099
NSN 5950-00-290-8090
NSN 5975-01-473-6033
NSN 5985-01-461-3423
NSN 6610-00-186-9180
NSN 5950-01-640-7387
NSN 6110-01-558-4928
NSN 6240-01-367-1925
NSN 6130-00-041-6468
NSN 6135-01-322-4655
NSN 5925-01-477-1673
NSN 5895-01-528-6538