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 6620-00-853-2563
NSN 6685-01-373-6658
NSN 6145-00-323-6021
NSN 2925-01-244-3016
NSN 5920-00-952-5360
NSN 5905-01-393-8824
NSN 5835-01-302-6844
NSN 6105-01-352-5788
NSN 6105-01-416-4796
NSN 5965-01-342-2865
NSN 5985-01-641-2731
NSN 5835-00-055-0953