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 5855-01-250-2421
NSN 6320-01-329-2297
NSN 5975-00-865-3537
NSN 7035-01-515-3490
NSN 5975-01-495-7975
NSN 6320-00-994-0179
NSN 5925-01-295-4991
NSN 5935-01-473-5945
NSN 5920-01-591-0006
NSN 6105-01-327-4124
NSN 6685-01-453-9951
NSN 5855-01-147-6024