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 6320-01-412-2973
NSN 5950-00-083-8398
NSN 5975-00-940-7820
NSN 5996-01-118-2296
NSN 5930-00-169-3307
NSN 6240-00-372-4841
NSN 5925-01-238-1899
NSN 6135-01-420-5907
NSN 5990-01-314-2264
NSN 6650-01-507-7004
NSN 6320-01-425-1417
NSN 5895-00-509-3095