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 5910-01-328-3348
NSN 7035-01-660-2518
NSN 5855-01-083-9053
NSN 5999-01-068-3639
NSN 5925-00-081-4575
NSN 5999-01-462-2429
NSN 5925-00-578-4774
NSN 6220-01-660-1900
NSN 5990-01-164-0220
NSN 5895-00-292-2872
NSN 5915-00-892-3011
NSN 5920-00-147-7975