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 6610-01-417-4389
NSN 5996-01-529-0639
NSN 4140-01-504-4349
NSN 6650-01-011-9093
NSN 6620-01-299-4563
NSN 4140-01-473-2143
NSN 6220-01-576-1030
NSN 6240-01-557-1177
NSN 5835-01-158-6878
NSN 5985-01-388-2079
NSN 5998-00-784-9298
NSN 6650-01-286-3417