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| Patents for Louis B. Erwin | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 764,282 | Jul. 05, 1904 | W.O. Duntley | Battery-cell | |
 | 871,436 | Nov. 19, 1907 | R. Parmelee | Pipe Wrench | |
 | 887,502 | May 12, 1908 | W.J. McVicker | Internal Combustion Engine | |
| 904,851 | Nov. 24, 1908 | W.O. Duntley, H.J. Kimman | Controller for electric drills | ||
 | 1,109,325 | Sep. 01, 1914 | W.O. Duntley | Electric drill | |