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| Patents for A. F. Schmidtbauer | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,253,828 | Jan. 15, 1918 | C.A. Hultquist | Drill Steel Retaining Device | ||
| 1,284,108 | Nov. 05, 1918 | C.A. Hultquist | Drilling Machine | ||