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 5835-00-825-2512
NSN 4140-01-493-5182
NSN 5965-01-430-4654
NSN 6110-00-271-9928
NSN 7035-01-424-7019
NSN 5996-01-146-5765
NSN 5835-00-505-2516
NSN 5996-01-185-2995
NSN 6145-01-482-7875
NSN 5925-00-119-8654
NSN 6645-00-547-4388
NSN 5915-01-023-9204