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 6610-01-206-5278
NSN 6650-01-178-8731
NSN 5930-01-013-4507
NSN 5990-01-524-7744
NSN 6110-00-324-8415
NSN 6240-01-225-4671
NSN 6240-01-384-3887
NSN 5895-01-344-2990
NSN 5930-01-175-1696
NSN 6645-01-099-2910
NSN 6645-01-195-0201
NSN 5835-00-279-1594