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| Patents for Horace L. Arnold | |||||
| Number | Date | Patentee | Title | Type | |
| 666,838 | Jan. 29, 1901 | H.L. Arnold | Explosive-Engine | internal combustion engines | |
| 666,839 | Jan. 29, 1901 | H.L. Arnold | Internal Combustion Engine | internal combustion engines | |