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 6145-01-459-0962
NSN 2925-01-175-1217
NSN 6320-00-593-0379
NSN 5990-01-521-7890
NSN 5915-01-492-5333
NSN 5905-01-205-0897
NSN 5935-01-308-4040
NSN 6610-00-925-5064
NSN 5999-01-415-0959
NSN 5835-01-091-8353
NSN 6130-00-994-5110
NSN 5905-01-190-7451