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| Patents for Henry C. Hart Mfg. Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
| 588,061 | Aug. 10, 1897 | H.C. Hart | Gas Engine | ||
| 588,062 | Aug. 10, 1897 | H.C. Hart | Gas Engine | ||
| 623,224 | Apr. 18, 1899 | E.j. Stoddard | Gas Motor Engine | ||