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 6620-01-606-8964
NSN 5930-01-097-8297
NSN 5915-00-302-9393
NSN 5960-01-177-7406
NSN 5960-01-142-1995
NSN 5985-01-408-6424
NSN 6320-01-570-8814
NSN 4140-00-486-0396
NSN 6320-01-399-6177
NSN 5910-01-312-4725
NSN 5920-01-394-4452
NSN 5910-01-425-1375