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 5998-00-008-2721
NSN 5930-00-891-2163
NSN 5925-01-077-1032
NSN 5905-01-152-2580
NSN 6105-00-862-6805
NSN 5905-00-177-7833
NSN 5835-01-576-9013
NSN 2925-01-134-9175
NSN 5945-00-810-1337
NSN 5990-00-133-7734
NSN 5960-01-227-8634
NSN 6620-00-684-6771