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 5975-01-519-7520
NSN 5920-00-686-2671
NSN 5975-01-399-0113
NSN 5895-00-984-1945
NSN 6220-01-342-2889
NSN 6240-01-509-1905
NSN 6650-01-433-8101
NSN 5910-01-358-1899
NSN 6685-01-259-6101
NSN 5985-00-182-8122
NSN 2925-01-210-6531
NSN 5895-00-257-8667