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| Patents for Fredy Erlach | |||||
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| Number | Date | Patentee | Title | Type | |
| 685,723 | Oct. 29, 1901 | T.C. Menges | Friction Clutch | clutches | |
| 723,540 | Mar. 24, 1903 | T.C. Menges | Igniter Operating Mechanism for Explosive Engines | ignition systems | |