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 7035-01-390-1132
NSN 6135-01-329-7994
NSN 5835-01-656-0261
NSN 5930-00-303-6925
NSN 5915-01-524-3847
NSN 6620-00-545-5689
NSN 5998-01-089-9442
NSN 5985-01-235-7068
NSN 2925-00-964-7128
NSN 5950-01-109-5396
NSN 6685-00-079-3307
NSN 5998-01-147-5326