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 6105-01-063-7704
NSN 6610-01-305-0954
NSN 5935-01-374-3329
NSN 5990-01-027-8260
NSN 4140-01-231-9419
NSN 5990-01-231-1214
NSN 6685-01-506-1860
NSN 5920-00-088-4674
NSN 5945-00-196-1404
NSN 5945-00-852-8698
NSN 6320-00-284-1524
NSN 5999-01-582-3649