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 5975-01-401-5355
NSN 6320-01-064-0372
NSN 5999-01-655-1338
NSN 6610-01-503-5656
NSN 6320-01-381-7023
NSN 5998-00-925-2992
NSN 5910-01-430-9395
NSN 5920-01-269-4191
NSN 7035-01-425-5962
NSN 6320-01-409-1388
NSN 6145-00-526-3056
NSN 5996-00-178-1016