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 2925-01-429-2235
NSN 6240-00-113-8820
NSN 6610-00-981-5682
NSN 5999-01-159-0330
NSN 5905-00-503-6065
NSN 5895-01-401-5388
NSN 5935-01-270-1081
NSN 6645-01-515-9951
NSN 6110-01-431-8889
NSN 5945-01-146-5464
NSN 6150-00-276-7483
NSN 5920-00-211-4512