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 5945-00-290-1779
NSN 5985-01-593-1086
NSN 5930-01-213-6519
NSN 2925-00-088-6790
NSN 5895-01-601-0741
NSN 5855-01-548-5688
NSN 5920-01-032-2133
NSN 5960-01-239-9651
NSN 5895-01-142-5272
NSN 5935-01-387-2721
NSN 5930-01-569-6367
NSN 6105-01-620-9398