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 5990-00-963-1799
NSN 5975-01-225-2946
NSN 6220-01-181-5854
NSN 6105-01-614-1908
NSN 6220-01-331-8983
NSN 6135-01-167-7604
NSN 5910-01-243-5930
NSN 2925-00-373-8837
NSN 6145-00-663-6133
NSN 5950-01-485-6178
NSN 5965-01-548-0965
NSN 5915-01-389-1065