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| All Patents in class 168/41 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 682,506 | Sep. 10, 1901 | O. Swanstrom | Horseshoe | |
 | 1,320,878 | Nov. 04, 1919 | G.E. Lindberg | Horseshoe | |
 | 1,688,601 | Oct. 23, 1928 | A.R. Swanstrom | Horseshoe | |
 | 1,862,499 | Jun. 07, 1932 | A.R. Swanstrom | Horseshoe Calk | |