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 5935-01-373-3759
NSN 6240-00-155-5817
NSN 5915-01-297-0818
NSN 5910-01-197-1946
NSN 6645-01-481-9140
NSN 2925-00-021-9580
NSN 5950-00-107-0793
NSN 7035-00-413-0992
NSN 5930-01-410-8706
NSN 5835-01-416-6455
NSN 4140-00-844-7680
NSN 6110-01-200-3517