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 5905-01-634-0595
NSN 2925-00-928-0045
NSN 5935-01-443-3535
NSN 5965-01-023-7095
NSN 6320-01-527-0211
NSN 5910-01-349-5595
NSN 5975-01-504-0210
NSN 5999-01-586-0847
NSN 6685-01-509-4957
NSN 5975-00-632-8772
NSN 5905-01-371-2923
NSN 5915-00-459-1762