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 6135-00-078-9931
NSN 5925-00-964-9654
NSN 4140-01-250-7159
NSN 6150-00-518-1853
NSN 6135-01-281-4758
NSN 6620-00-495-7438
NSN 6110-01-004-2398
NSN 6320-00-160-0899
NSN 7035-01-052-3815
NSN 5895-01-331-6946
NSN 6150-01-526-8741
NSN 5996-01-069-2915