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| Patents for Harold A. McGowan | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,668,245 | May 01, 1928 | H.A. McGowan | Crank Case Implement | automotive specialty wrenches | |
| CA-293,704 | Oct. 08, 1928 | H.A. McGowan | Crank Case Implement | automotive specialty wrenches | |