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 6145-00-526-3056
NSN 5950-00-556-3123
NSN 4140-01-133-6446
NSN 7035-01-183-7550
NSN 5930-01-629-9486
NSN 6645-01-407-0204
NSN 5855-00-228-8446
NSN 6240-01-381-2036
NSN 5996-01-508-0598
NSN 2925-01-509-3783
NSN 5855-01-118-2228
NSN 6220-01-535-0892