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| Patents for Gottfried Piel | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,130,082 | Mar. 02, 1915 | J. Halterbeck | Woodworking-Vise | bench vises | |
| 1,212,214 | Jan. 16, 1917 | J. Halterbeck | Abrading-machine | sanding machines | |