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 5965-00-698-0433
NSN 6610-01-082-3531
NSN 6130-00-445-5129
NSN 6135-01-477-5259
NSN 6135-00-833-9909
NSN 5999-01-120-2575
NSN 6620-01-003-2905
NSN 6320-01-123-6814
NSN 5910-00-089-1175
NSN 5999-01-578-6763
NSN 6150-01-532-9593
NSN 5935-01-486-1311