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| Patents for D. M. Stewart | |||||
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| Number | Date | Patentee | Title | Type | |
| 343,628 | Jun. 15, 1886 | J.W. Day | Ratchet Wrench | ratchet wrenches | |
| 771,858 | Oct. 11, 1904 | J.H. Brown | Commutator | electric motors | |