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 5920-01-066-3709
NSN 6685-01-397-8694
NSN 5835-00-480-2682
NSN 5996-00-916-3038
NSN 6135-01-629-6940
NSN 5895-01-359-9010
NSN 6110-00-377-9160
NSN 5915-00-982-2859
NSN 5920-00-402-1752
NSN 5905-01-615-0404
NSN 5996-01-189-1553
NSN 5998-01-214-9884