Richard B. Mellon | |
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| Born | March 19, 1858 Pittsburgh, Pennsylvania, U.S. |
| Died | December 1, 1933 (aged 75) Pittsburgh, Pennsylvania, U.S. |
| Nationality | American |
| Alma mater | University of Pittsburgh |
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Richard Beatty Mellon (March 19, 1858 – December 1, 1933), sometimes R.B., was a banker, industrialist, and philanthropist from Pittsburgh, Pennsylvania. He was the son of Mellon family patriarch Thomas Mellon.