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 5930-01-343-7971
NSN 5985-00-813-2041
NSN 5960-01-369-8666
NSN 5905-00-417-3718
NSN 4140-01-359-2895
NSN 5999-01-214-6348
NSN 6610-01-086-5071
NSN 5930-01-199-6352
NSN 6135-00-422-3967
NSN 5999-01-108-7361
NSN 6620-01-228-1571
NSN 6240-00-627-9007