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 5975-00-234-7516
NSN 6650-01-424-8048
NSN 6620-01-492-8470
NSN 6110-01-169-4554
NSN 5975-01-337-4655
NSN 6645-01-245-4341
NSN 5895-01-594-8740
NSN 6620-01-043-5169
NSN 5965-01-151-0903
NSN 5930-00-156-3386
NSN 5895-00-097-8948
NSN 6130-00-248-7244