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| Patents for Mary Elward | |||||
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| Number | Date | Patentee | Title | Type | |
| 279,925 | Jun. 26, 1883 | J.H. Elward | Traction Engine | steam traction engines | |
| 329,153 | Oct. 27, 1885 | J.H. Elward | Traction Engine | traction engine propulsion components | |
| 329,154 | Oct. 27, 1885 | J.H. Elward | Traction Engine | steam traction engines | |