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 5999-00-830-1395
NSN 6620-00-075-6667
NSN 5895-01-063-8104
NSN 6320-01-497-3116
NSN 6650-01-078-8179
NSN 6150-01-592-4013
NSN 6145-01-512-4838
NSN 6110-00-614-9218
NSN 6320-01-630-7629
NSN 6645-00-100-7218
NSN 5895-01-099-4794
NSN 6645-01-521-3180