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 6110-01-360-5661
NSN 5920-01-144-9826
NSN 5895-01-030-0492
NSN 6130-01-157-1822
NSN 7035-00-267-5424
NSN 5895-00-757-9250
NSN 5990-01-013-8464
NSN 5960-01-520-3540
NSN 6645-01-510-3496
NSN 5930-00-591-7596
NSN 6645-01-134-8137
NSN 5935-01-154-7922