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| Patents for Pier-Luigi Focardi | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,217,910 | Mar. 06, 1917 | H.C. Brown | Vise | combined anvil vises and drills | |
| 1,217,911 | Mar. 06, 1917 | H.C. Brown | Drill mechanism | combined anvil vises and drills | |