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 6650-01-543-7048
NSN 5960-01-495-0859
NSN 5895-01-363-6738
NSN 6105-00-614-8003
NSN 2925-01-250-2731
NSN 6220-01-179-9637
NSN 5965-01-499-5482
NSN 6145-01-634-0388
NSN 4140-01-394-9252
NSN 5920-00-607-3385
NSN 5920-00-629-0442
NSN 5999-01-172-0340