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 5915-01-204-7889
NSN 6105-01-258-5884
NSN 5975-01-214-3518
NSN 6650-01-029-2995
NSN 5960-00-839-1529
NSN 5965-00-997-5764
NSN 6650-00-139-5459
NSN 5950-01-246-3984
NSN 6610-01-240-9690
NSN 5855-01-274-5311
NSN 5855-00-237-4088
NSN 2925-01-624-2965