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 5975-01-163-0464
NSN 5915-01-133-1651
NSN 5990-01-617-5156
NSN 6240-01-190-9523
NSN 7035-01-268-0933
NSN 6685-00-402-2458
NSN 5990-00-023-4163
NSN 5895-01-435-5497
NSN 6110-00-369-8499
NSN 6320-01-578-6006
NSN 5835-01-070-1882
NSN 5996-01-311-9615