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 5998-00-823-9474
NSN 5990-01-580-2191
NSN 5905-01-522-2799
NSN 5895-01-446-6217
NSN 5835-01-176-5422
NSN 6130-01-182-3675
NSN 7035-01-026-1171
NSN 6650-00-276-9838
NSN 5915-01-487-3883
NSN 5960-00-539-6739
NSN 6110-01-071-4465
NSN 2925-01-026-1000