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| Patents for Davis D. Hobbs | |||||
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| Picture | Number | Date | Patentee | Title | |
| 460,070 | Sep. 22, 1891 | J.T. Hobbs, D.D. Hobbs | Rotary Gas Engine | ||
| 506,817 | Oct. 17, 1893 | D.D. Hobbs | Gas Engine | ||
| 613,417 | Nov. 01, 1898 | D.D. Hobbs | Gas Engine | ||