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 5855-01-535-7127
NSN 6610-00-076-5613
NSN 5975-01-500-1794
NSN 5920-01-303-6841
NSN 6650-00-762-0267
NSN 6110-01-482-8022
NSN 5965-01-450-5954
NSN 5920-00-636-4713
NSN 7035-00-286-6221
NSN 5975-01-462-5664
NSN 5985-00-719-9944
NSN 6150-01-131-4562