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 5920-01-337-3823
NSN 5915-01-556-4282
NSN 6135-01-100-3593
NSN 6130-01-593-9155
NSN 6135-00-299-6918
NSN 5905-01-124-0502
NSN 5910-01-382-6950
NSN 5895-01-294-1482
NSN 6150-01-206-5799
NSN 5835-01-390-0880
NSN 7035-01-241-2127
NSN 2925-01-415-2140