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| Patents for R. Burkhardt | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,178,007 | Apr. 04, 1916 | A. Gloor | Wrench | pipe and nut combination wrenches | |
| 1,249,300 | Dec. 11, 1917 | W.A. Barker | Chuck | metal lathe chucks | |
| 1,391,039 | Sep. 20, 1921 | C.H. Beach | Electric Grinder | ||