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 5990-01-439-4643
NSN 5945-01-423-1009
NSN 6610-00-036-9878
NSN 6105-01-531-2157
NSN 5965-01-276-4650
NSN 5960-01-141-9986
NSN 5835-01-279-9508
NSN 5960-01-029-1548
NSN 5996-00-305-6152
NSN 5895-01-363-5514
NSN 5855-01-308-0955
NSN 4140-01-634-0330