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 7035-01-604-3032
NSN 5999-01-129-9749
NSN 6110-01-508-6563
NSN 6150-00-862-1081
NSN 6645-00-825-5677
NSN 6130-01-234-4549
NSN 5930-01-410-3436
NSN 4140-01-422-3176
NSN 6645-00-881-9978
NSN 5925-01-266-1093
NSN 5920-01-492-9173
NSN 5935-01-287-9666