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 6130-01-600-3470
NSN 5935-00-540-9066
NSN 5965-00-969-5795
NSN 5965-01-640-7104
NSN 5975-01-634-0678
NSN 6685-01-618-7131
NSN 7035-00-167-7411
NSN 5915-01-013-8995
NSN 5920-01-496-1309
NSN 5915-01-253-1469
NSN 5999-01-132-4638
NSN 5835-01-306-5511