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 5895-00-212-7451
NSN 5935-00-359-5243
NSN 5930-01-135-1716
NSN 6650-01-430-9416
NSN 6130-01-634-0603
NSN 5835-00-170-5238
NSN 5910-00-435-2837
NSN 5895-01-094-3121
NSN 5996-01-146-9481
NSN 5920-01-634-0250
NSN 6685-01-186-4838
NSN 5895-01-124-5432