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 6240-00-891-8586
NSN 5925-01-075-7964
NSN 6105-01-658-5095
NSN 6150-01-614-1927
NSN 6220-01-648-2184
NSN 5985-01-139-2735
NSN 5920-00-558-6792
NSN 6150-01-555-9412
NSN 6110-00-222-8955
NSN 5965-00-624-4134
NSN 5925-00-081-9135
NSN 2925-01-022-3181