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| Patents for Howard P. Denison | |||||
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| Number | Date | Patentee | Title | Type | |
| 843,831 | Feb. 12, 1907 | E.G. Latta | Type-writing machine | typewriters | |
| 853,930 | May 14, 1907 | C. Miller | Ratchet Wrench | ratchet wrenches | |
| 897,610 | Sep. 01, 1908 | R.I. Fancher | Flexible Power Transmitting Mechanism | metalworking machine mechanisms | |