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 5999-01-108-2488
NSN 6240-01-147-0379
NSN 5985-01-435-6642
NSN 5999-00-950-6909
NSN 5999-01-609-8691
NSN 6685-01-651-8510
NSN 6610-01-174-1622
NSN 5998-00-984-6047
NSN 6610-00-800-7392
NSN 5965-00-990-8669
NSN 6650-01-146-5000
NSN 7035-00-300-3208