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 7035-01-571-8784
NSN 5960-00-253-7815
NSN 6240-00-757-9518
NSN 5965-01-378-7335
NSN 5905-01-481-3943
NSN 5835-00-752-6065
NSN 5990-01-126-5824
NSN 5975-01-047-0587
NSN 5835-00-891-2784
NSN 5915-01-069-9227
NSN 6240-01-655-5877
NSN 5999-01-498-2607