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 6135-00-269-5843
NSN 6650-01-042-9360
NSN 5905-00-173-1043
NSN 6145-00-935-8628
NSN 5910-00-892-3187
NSN 5990-01-268-6767
NSN 6150-01-492-3460
NSN 6610-01-099-9710
NSN 5965-01-121-6135
NSN 6105-00-956-6357
NSN 6320-01-017-5274
NSN 6645-01-530-3654