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 5925-01-012-1890
NSN 5855-01-571-1557
NSN 6145-00-765-6736
NSN 5855-01-433-2220
NSN 5835-00-337-7801
NSN 5910-01-517-2220
NSN 5999-00-372-5709
NSN 6130-01-338-5962
NSN 6145-01-101-9539
NSN 5895-00-717-5234
NSN 5835-01-310-8979
NSN 6150-00-916-5922