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 5935-01-400-5949
NSN 6610-01-633-8931
NSN 5996-00-186-8709
NSN 6620-01-336-2663
NSN 5835-00-404-6149
NSN 6645-00-127-3835
NSN 6150-00-186-7804
NSN 7035-01-024-9511
NSN 5965-01-570-2804
NSN 6650-00-740-7338
NSN 5835-01-642-4705
NSN 4140-00-009-0233