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 5930-00-421-1005
NSN 5905-00-265-8892
NSN 6105-00-138-0616
NSN 2925-01-633-4048
NSN 6150-01-333-1116
NSN 5905-01-634-0595
NSN 6650-00-026-8139
NSN 5990-00-826-0991
NSN 5930-00-786-1857
NSN 5930-01-201-2313
NSN 5910-01-297-4152
NSN 5999-00-833-4362