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 6135-00-819-8074
NSN 6645-01-505-5772
NSN 5975-01-499-6979
NSN 6620-01-062-7163
NSN 5910-01-521-1955
NSN 5835-01-203-1871
NSN 5855-00-466-2309
NSN 5999-01-179-5773
NSN 6145-01-509-5822
NSN 6150-00-468-5416
NSN 6130-01-545-4007
NSN 4140-00-347-6807