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 5905-00-420-4251
NSN 6610-00-536-1446
NSN 2925-01-225-0713
NSN 5910-01-020-7700
NSN 5965-01-396-3184
NSN 5910-01-387-0940
NSN 5925-00-468-2757
NSN 6620-00-071-3895
NSN 5945-01-435-9422
NSN 5999-00-254-5111
NSN 5945-01-349-7116
NSN 5960-01-314-1822