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| Patents for Frederick Leu | |||||
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| Number | Date | Patentee | Title | Type | |
| 328,320 | Oct. 13, 1885 | F. Leu | Countersink | countersinks | |
| 680,870 | Aug. 20, 1901 | F. Leu | Device for Attaching Rubber Washer to Bottle Stoppers | bottle washer expanders | |