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| Patents for E. L. Clarkson | |||||
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| Number | Date | Patentee | Title | Type | |
| 360,616 | Apr. 05, 1887 | J.J. Philbrick | Stave-planer | cooper | |
| 360,617 | Apr. 05, 1887 | J.J. Philbrick | Stave-jointing machine | cooper | |