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 5920-00-687-2066
NSN 5835-01-502-9228
NSN 5965-00-777-7037
NSN 5925-01-553-8498
NSN 6685-01-394-7547
NSN 5935-01-129-1220
NSN 5960-00-553-7338
NSN 6110-01-573-5294
NSN 5930-00-441-9691
NSN 5835-01-302-2745
NSN 6620-00-518-3595
NSN 5855-00-962-5792