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 6220-01-206-9812
NSN 5975-01-198-9916
NSN 5996-01-363-7130
NSN 5905-01-295-3700
NSN 5930-01-013-8529
NSN 5999-01-360-0649
NSN 6320-01-343-5846
NSN 5985-00-868-8769
NSN 5996-01-476-7550
NSN 6110-01-302-1824
NSN 5930-01-430-2119
NSN 5905-01-345-0147