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| Patents for H. J. Ennis | |||||
| Number | Date | Patentee | Title | Type | |
| 577,632 | Feb. 23, 1897 | C.E. Thompson | Monkey Wrench | wrench handle components | |
| 585,533 | Jun. 29, 1897 | D.J. Quin | Ratchet Wrench | ratchet wrenches | |