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 5915-01-304-5114
NSN 6645-00-321-6071
NSN 6220-01-660-8556
NSN 5895-01-460-3915
NSN 5915-00-843-2990
NSN 5895-01-052-0322
NSN 5999-01-634-0576
NSN 6145-01-450-3977
NSN 6220-01-154-0204
NSN 6610-00-406-3107
NSN 5915-01-206-1208
NSN 5990-01-432-4249