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 5960-00-707-3335
NSN 5996-01-383-4029
NSN 7035-01-255-2332
NSN 6220-01-497-6244
NSN 6110-01-643-5558
NSN 5905-01-457-9881
NSN 4140-01-179-0797
NSN 6105-00-664-1292
NSN 5935-01-609-1986
NSN 6620-00-585-5443
NSN 6145-01-485-6319
NSN 6620-01-476-7355