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 6110-00-501-5585
NSN 2925-00-343-3235
NSN 6650-00-251-0712
NSN 7035-00-238-3662
NSN 6320-00-483-0451
NSN 5935-01-374-3329
NSN 6685-01-134-9305
NSN 6145-00-832-5323
NSN 5960-00-228-0636
NSN 5985-01-437-3635
NSN 5920-01-623-8840
NSN 5965-01-532-2112