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 5950-00-825-4523
NSN 7035-00-897-7567
NSN 5985-01-428-4484
NSN 5985-00-938-7090
NSN 2925-01-380-0869
NSN 5935-00-159-0178
NSN 6620-01-288-4922
NSN 5920-01-146-6690
NSN 6110-01-269-5943
NSN 5835-00-898-0201
NSN 5996-01-024-8898
NSN 6220-01-363-4772