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 6645-01-521-3180
NSN 6240-01-396-7883
NSN 6220-00-823-6688
NSN 6105-01-227-7072
NSN 5999-01-379-7941
NSN 6130-01-295-0456
NSN 4140-01-370-4075
NSN 6620-01-451-3742
NSN 6110-01-520-6498
NSN 5835-01-355-0308
NSN 6110-01-560-5080
NSN 5895-01-645-4716