R. Holland Duell | |
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| United States Commissioner of Patents | |
| In office October 1, 1875 – January 30, 1877 | |
| Chairman of the Committee on Expenditures on Public Buildings | |
| In office 1873–1875 | |
| Member of the U.S. House of Representatives from New York | |
| In office March 4, 1871 – March 3, 1875 | |
| Preceded by | Dennis McCarthy |
| Succeeded by | William H. Baker |
| Constituency | 23rd district (1871–73) 24th district (1873–75) |
| In office March 4, 1859 – March 3, 1863 | |
| Preceded by | Henry Bennett |
| Succeeded by | Francis Kernan |
| Constituency | 21st district |
| Chairman of the Committee on Revolutionary Claims | |
| In office 1861–1863 | |
| Judge of Cortland County, New York | |
| In office 1855–1859 | |
| District attorney of Cortland County, New York | |
| In office 1850–1855 | |
| Personal details | |
| Born | December 20, 1824 Warren, New York, U.S. |
| Died | February 11, 1891 (aged 66) Cortland, New York, U.S. |
| Resting place | Cortland Rural Cemetery |
| Political party | Republican |
| Spouse | Mary L. Cuyler |
| Children | 2 |
| Signature |  |
Rodolphus (sometimes Robert) Holland Duell (December 20, 1824 – February 11, 1891) was an American lawyer and politician from New York. He was elected to Congress and became United States Commissioner of Patents.