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 5945-01-091-3437
NSN 6610-01-371-3006
NSN 5930-01-435-6542
NSN 5998-00-892-8438
NSN 5835-01-085-4300
NSN 6105-00-957-5703
NSN 6135-00-062-5080
NSN 5950-00-605-1925
NSN 6130-01-642-9326
NSN 6620-00-262-3113
NSN 5985-01-465-4141
NSN 4140-01-595-0715