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 5905-00-767-1723
NSN 5965-01-349-9029
NSN 6135-00-268-8492
NSN 4140-00-679-8630
NSN 6150-01-507-0791
NSN 5996-00-174-5107
NSN 5925-00-758-2787
NSN 5996-01-207-0804
NSN 2925-00-782-1498
NSN 6610-00-781-5787
NSN 6320-01-242-8355
NSN 5855-01-496-1234