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 5910-01-115-0748
NSN 5915-01-513-2531
NSN 6145-01-006-9548
NSN 5999-01-251-9640
NSN 5895-01-259-9931
NSN 5925-00-008-4413
NSN 5905-01-321-8037
NSN 6220-01-501-7907
NSN 6220-01-141-7709
NSN 5996-01-444-3915
NSN 5925-01-241-8257
NSN 6220-01-211-4630