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| Patents for O. R. Erwin | |||||
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| Number | Date | Patentee | Title | Type | |
| 868,114 | Oct. 15, 1907 | O. Obermeyer | Marking-Gage | butt gauges | |
| 948,686 | Feb. 08, 1910 | F.J. Hatch | Device for filling pipe joints | plumber | |
| 977,972 | Dec. 06, 1910 | C.A. Shaler | Vulcanizer | rubber tire repair tools | |
| 994,216 | Jun. 06, 1911 | J.M. Thompson | Grinding-machine | sharpening machines | |