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 5920-01-201-2252
NSN 5855-01-225-5855
NSN 5895-01-513-8385
NSN 5920-01-363-1426
NSN 5998-00-269-3775
NSN 5998-01-457-9023
NSN 5925-01-432-8431
NSN 5895-00-582-1128
NSN 6650-00-230-4575
NSN 5998-01-113-7120
NSN 6620-01-104-5758
NSN 6645-01-651-6119