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 5975-01-542-4606
NSN 5895-00-201-3742
NSN 6130-00-619-2113
NSN 6650-01-024-9554
NSN 6135-01-130-3145
NSN 6105-01-372-9157
NSN 5920-01-534-8673
NSN 6110-00-456-2058
NSN 5950-01-647-1647
NSN 5996-00-855-7619
NSN 6685-01-259-8527
NSN 5945-01-486-2872