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 5996-01-174-3183
NSN 5965-00-341-9312
NSN 5990-01-003-4209
NSN 6650-00-614-1711
NSN 6610-00-197-7648
NSN 6240-01-575-3159
NSN 5925-01-277-8537
NSN 6220-00-981-3057
NSN 5999-00-013-5116
NSN 6320-00-313-9114
NSN 5999-01-332-2527
NSN 5990-01-130-4959