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 7035-01-556-9060
NSN 6130-01-544-3278
NSN 5910-00-003-2656
NSN 5998-01-428-4238
NSN 5835-00-770-2843
NSN 4140-01-454-7856
NSN 5998-01-297-1749
NSN 5996-01-473-2183
NSN 6220-01-584-5834
NSN 5975-01-599-0539
NSN 6240-01-334-6961
NSN 5855-01-225-5855