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 4140-00-451-8374
NSN 5835-00-003-0295
NSN 6105-01-330-3685
NSN 6150-01-550-0820
NSN 5925-01-463-8594
NSN 5855-01-561-7757
NSN 5990-01-544-4360
NSN 5895-01-140-1048
NSN 6145-01-492-5098
NSN 7035-00-215-3272
NSN 5855-01-149-4110
NSN 5996-00-278-5193