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 6320-01-569-2672
NSN 5910-01-145-5166
NSN 5910-01-468-8198
NSN 5935-01-091-3589
NSN 6610-01-592-1551
NSN 5999-00-732-2884
NSN 6220-01-325-1817
NSN 5999-00-074-0544
NSN 5835-01-252-5879
NSN 5996-01-096-4115
NSN 6150-01-130-8102
NSN 6135-01-598-9889