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| All Patents of Type: center finders | |||||
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| Number | Date | Patentee | Title | Type | |
| 902,738 | Nov. 03, 1908 | L.J. Jones | Centering Device | center finders | |
| 966,500 | Aug. 09, 1910 | G.F. Wegner | Combined Holder and Centering Tool | center finders | |
| 1,040,715 | Oct. 08, 1912 | H. Mann | Centering Device | center finders | |
| 1,365,289 | Jan. 11, 1921 | C. Snell | Center Gage and Micrometer | center finders | |
| 1,422,746 | Jul. 11, 1922 | K.W. Couse | Keyway Locator | center finders | |
| 3,985,462 | Oct. 12, 1976 | T.P. Didato | V Block Center Finder | V blocks | |