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 5990-01-026-9286
NSN 5925-01-100-0970
NSN 5920-00-144-8031
NSN 7035-01-069-3537
NSN 6320-00-456-0836
NSN 6610-01-141-7014
NSN 6645-00-274-1279
NSN 6620-00-895-3879
NSN 6240-00-234-5781
NSN 6150-01-385-1854
NSN 5930-01-517-8352
NSN 6150-01-545-5026