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 5855-01-488-5515
NSN 5935-01-092-2597
NSN 6220-01-055-7423
NSN 4140-00-011-9444
NSN 5915-01-346-1833
NSN 5915-01-422-0564
NSN 5930-00-636-8888
NSN 6135-01-531-1413
NSN 6685-01-621-7698
NSN 5975-01-231-7921
NSN 5855-01-400-1590
NSN 5960-01-389-4055