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 5950-01-445-7127
NSN 5998-00-466-3142
NSN 5855-01-616-4391
NSN 5990-00-518-3195
NSN 5990-01-612-5323
NSN 5935-00-701-2364
NSN 5855-00-482-9876
NSN 5985-01-005-0370
NSN 5910-00-528-9714
NSN 5930-01-224-7224
NSN 5905-00-741-3431
NSN 6650-00-955-2802