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 6645-01-068-3042
NSN 5925-00-731-7710
NSN 5910-01-483-5432
NSN 6150-01-480-5150
NSN 5965-01-030-7253
NSN 6130-01-446-7404
NSN 5998-00-673-2880
NSN 5930-00-445-1719
NSN 5835-00-302-5296
NSN 5985-00-280-8057
NSN 5930-00-516-1217
NSN 2925-01-357-2512