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 6135-01-025-8109
NSN 6105-01-353-0959
NSN 5960-01-408-6290
NSN 5935-01-316-0995
NSN 2925-00-400-5634
NSN 5985-00-230-7988
NSN 5920-01-468-5911
NSN 6650-01-558-9071
NSN 6240-01-478-8488
NSN 4140-00-423-6663
NSN 5975-01-551-7000
NSN 5950-00-559-7938