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 5895-01-041-8016
NSN 6220-00-825-2783
NSN 5975-00-851-6085
NSN 6135-01-335-9184
NSN 5950-01-411-5950
NSN 5985-00-516-2373
NSN 5975-01-227-5543
NSN 2925-01-074-2718
NSN 5999-01-508-4379
NSN 6130-00-704-6589
NSN 5920-01-313-2293
NSN 5835-01-495-0595