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 6320-01-457-2805
NSN 5965-01-147-5847
NSN 6220-00-581-3858
NSN 5999-01-246-8592
NSN 5920-01-322-7553
NSN 6110-01-563-5515
NSN 6130-00-468-6222
NSN 5985-01-388-3503
NSN 6105-01-246-7402
NSN 5945-01-446-3247
NSN 5996-01-585-6126
NSN 5975-01-212-9822