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 6650-01-113-7563
NSN 6110-01-026-7619
NSN 6610-00-443-2980
NSN 7035-01-620-0131
NSN 5920-01-161-8120
NSN 4140-01-106-2559
NSN 5925-01-419-4858
NSN 5895-01-597-7993
NSN 5990-01-647-8574
NSN 5905-01-186-8421
NSN 6240-01-083-4697
NSN 6220-01-270-9885