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 5920-01-304-4034
NSN 6110-00-285-1895
NSN 5960-01-641-5493
NSN 5945-01-131-5092
NSN 5835-00-474-6085
NSN 5998-01-416-9479
NSN 7035-01-383-6549
NSN 5950-00-274-7228
NSN 6150-01-553-0144
NSN 5930-01-040-3465
NSN 5925-01-261-4215
NSN 5895-01-225-8658