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| All Patents in class 168/13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,043,358 | Jun. 09, 1936 | C. Swanstrom | Horseshoe | ||
| 2,043,359 | Jun. 09, 1936 | O. Swanstrom | Horseshoe | ||
| 2,067,427 | Jan. 12, 1937 | A.R. Swanstrom | Horseshoe | ||