What type of details about rudolf bing can be gathered from the following bio? Bio: sir rudolf bing -lrb- january 9 , 1902 -- september 2 , 1997 -rrb- was an austrian-born opera impresario who worked in germany , the united kingdom and the united states , most notably being general manager of the metropolitan opera in new york city from 1950 to 1972 . he became a british citizen in 1946 and was knighted by queen elizabeth ii in 1971 .
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