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 5975-00-527-9656
NSN 6145-01-134-2001
NSN 5960-01-221-9464
NSN 6145-00-366-5790
NSN 5895-00-776-6079
NSN 5999-00-823-6151
NSN 2925-01-090-2391
NSN 5990-01-118-7706
NSN 5950-01-278-9057
NSN 5855-00-014-5008
NSN 6105-01-331-3048
NSN 6130-01-522-9384