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 4140-01-331-8305
NSN 6145-01-377-9935
NSN 5855-00-906-5386
NSN 5990-01-453-3552
NSN 6650-01-129-8343
NSN 5930-00-120-1048
NSN 6320-00-004-9158
NSN 5990-01-476-8813
NSN 5996-01-317-2948
NSN 5910-01-653-2345
NSN 5895-00-372-5493
NSN 6685-01-044-6366