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 5999-00-132-5586
NSN 6685-00-512-1862
NSN 5945-01-570-5526
NSN 6220-00-520-2603
NSN 5920-01-471-7771
NSN 5930-01-500-1799
NSN 5855-01-462-0495
NSN 6685-00-634-9964
NSN 5999-00-989-5685
NSN 4140-01-623-9478
NSN 5835-01-495-5986
NSN 5895-01-450-1835