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 5985-01-257-5600
NSN 5910-01-642-7855
NSN 6620-00-684-6771
NSN 5965-00-898-1356
NSN 6240-01-552-8831
NSN 5965-01-026-9865
NSN 5930-01-197-8115
NSN 6610-01-573-2697
NSN 5925-00-687-1625
NSN 5920-01-605-4979
NSN 6240-01-503-8717
NSN 2925-01-197-7864