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 6620-01-091-9697
NSN 5930-00-186-2442
NSN 6320-00-681-1324
NSN 6135-01-167-7604
NSN 6240-00-269-9477
NSN 6320-00-937-5625
NSN 5915-00-253-5142
NSN 5945-01-365-0754
NSN 6105-01-394-2603
NSN 5985-00-853-3558
NSN 6110-01-301-0748
NSN 6145-01-199-6291