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 5985-01-060-3457
NSN 4140-01-378-6710
NSN 5895-01-579-8130
NSN 6145-00-213-9177
NSN 5990-01-018-3953
NSN 6135-01-461-6521
NSN 6645-00-968-6118
NSN 5925-01-338-2404
NSN 6620-01-462-5196
NSN 6130-01-417-0797
NSN 6105-01-282-3590
NSN 5998-01-528-9403