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 2925-01-261-0701
NSN 5960-01-106-1491
NSN 6610-01-155-2976
NSN 6645-01-633-1852
NSN 5965-01-176-9052
NSN 6620-01-061-0599
NSN 5999-01-203-6137
NSN 4140-00-654-9146
NSN 6135-01-521-0378
NSN 6610-01-614-3703
NSN 5935-00-798-5746
NSN 5855-01-420-4988