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 6105-00-165-1619
NSN 5996-01-579-6558
NSN 6685-01-348-5980
NSN 6610-01-352-2976
NSN 4140-00-401-3123
NSN 6110-01-429-0008
NSN 5920-01-341-6741
NSN 6130-00-756-4271
NSN 6105-01-010-5953
NSN 5835-00-572-7445
NSN 6220-00-017-2409
NSN 4140-01-215-0298