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 5915-00-451-4261
NSN 5905-01-461-6304
NSN 6130-01-089-9646
NSN 5905-00-186-0942
NSN 6220-01-464-3618
NSN 5985-01-066-0987
NSN 7035-00-096-9986
NSN 6145-00-286-9588
NSN 6105-01-169-3987
NSN 2925-00-149-0760
NSN 5935-00-079-1650
NSN 2925-01-264-1699