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 5998-00-807-0515
NSN 5895-01-534-9914
NSN 5920-00-770-2015
NSN 6105-00-617-5490
NSN 6650-00-947-1354
NSN 5920-01-614-1997
NSN 5960-01-216-7004
NSN 5905-01-519-6346
NSN 5935-00-306-0987
NSN 5996-01-211-3562
NSN 6130-01-227-2250
NSN 4140-01-128-6217