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 5990-01-314-8591
NSN 5835-01-261-2978
NSN 6220-00-233-7436
NSN 5855-00-925-0114
NSN 5895-00-233-5901
NSN 6110-00-764-2014
NSN 6135-01-506-0759
NSN 5999-01-379-5335
NSN 6145-01-061-0962
NSN 6135-01-100-3593
NSN 5965-01-322-8136
NSN 5985-01-276-9986