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| Patents for H. M. Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 18,135 | Sep. 08, 1857 | H.M. Clark | Hinged Claw and Screw-Adjusting Gripper Wrench | pipe wrenches | |
| 141,745 | Aug. 12, 1873 | G.F. Almy | Improvement in Hollow Augers | hollow bits | |