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 5835-01-426-0069
NSN 5945-01-381-9417
NSN 2925-00-188-5003
NSN 6685-01-359-9166
NSN 4140-01-457-7727
NSN 5960-01-320-9779
NSN 5999-01-579-1451
NSN 5999-00-306-4691
NSN 5985-01-014-8882
NSN 5925-00-841-9425
NSN 5855-01-047-9267
NSN 5975-01-628-6524