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 5998-01-164-6829
NSN 6130-00-686-4906
NSN 5925-01-147-5725
NSN 5935-01-243-1137
NSN 5895-01-623-4694
NSN 5855-00-479-9819
NSN 6620-00-153-6291
NSN 6320-01-612-7035
NSN 5930-01-520-5782
NSN 5975-00-553-6995
NSN 5965-01-104-5102
NSN 5998-01-364-1402