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 6130-01-276-1303
NSN 2925-00-943-2263
NSN 5915-01-258-4911
NSN 5996-01-145-4357
NSN 6105-01-358-8068
NSN 6320-00-553-8427
NSN 6135-00-702-2772
NSN 6145-01-338-8344
NSN 5999-00-274-6294
NSN 5999-01-243-0781
NSN 5920-01-605-1468
NSN 6145-01-390-9015