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 5990-01-068-1651
NSN 5965-00-886-5507
NSN 6145-00-966-2377
NSN 6145-01-506-3668
NSN 5930-01-323-5875
NSN 5996-01-440-9660
NSN 5960-01-341-5198
NSN 6620-00-189-0967
NSN 6105-01-511-0383
NSN 5930-01-417-2595
NSN 4140-00-454-3786
NSN 4140-00-753-9204