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 5910-01-283-6603
NSN 6135-01-069-2482
NSN 6620-01-254-7963
NSN 6650-00-104-9611
NSN 5915-01-513-9122
NSN 7035-01-100-9295
NSN 5945-00-593-1736
NSN 5925-01-420-6924
NSN 5895-01-432-0991
NSN 5895-01-527-4297
NSN 5999-01-391-4996
NSN 6685-01-381-6077