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| Patents for Joseph F. Letellier | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 30,485 | Oct. 23, 1860 | J.F. Letellier | Steam Valve | |
 | 92,848 | Jul. 20, 1869 | J.F. Letellier | Governor | |
 | 96,450 | Nov. 02, 1869 | J.F. Letellier, A. Leitelt | Improvement in sawing-machine | |