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 6240-00-624-1752
NSN 6110-01-384-3259
NSN 5990-00-962-2806
NSN 5999-00-452-9641
NSN 6610-01-607-4525
NSN 5985-01-055-5656
NSN 6685-01-068-7704
NSN 2925-01-094-4771
NSN 5960-01-200-4621
NSN 5925-00-389-6433
NSN 5905-01-009-0932
NSN 4140-00-522-4069