| Patents for Louis B. Erwin |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 764,282 | Jul. 05, 1904 | W.O. Duntley | Battery-cell | |
| 871,436 | Nov. 19, 1907 | R. Parmelee | Pipe Wrench | chain and strap wrenches |
| 887,502 | May 12, 1908 | W.J. McVicker | Internal Combustion Engine | internal combustion engine valves |
| 904,851 | Nov. 24, 1908 | W.O. Duntley, H.J. Kimman | Controller for electric drills | handheld power drills |
| 1,071,346 | Aug. 26, 1913 | J.A. Reeves | Panoramic Camera | panoramic cameras |
| 1,109,325 | Sep. 01, 1914 | W.O. Duntley | Electric drill | handheld power drills |
