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 5998-01-330-2237
NSN 5895-01-062-0002
NSN 5945-00-456-0275
NSN 5945-00-083-4086
NSN 6650-01-500-4549
NSN 5925-01-050-4265
NSN 5985-01-466-7499
NSN 6650-00-842-5463
NSN 6220-01-034-1231
NSN 2925-00-246-3077
NSN 5998-01-095-6052
NSN 5920-00-776-0633