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| Patents for Charles Billon | |||||
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| Number | Date | Patentee | Title | Type | |
| 432,621 | Jul. 22, 1890 | F. Holz | Milling Machine | indexers and dividers | |
| 439,154 | Oct. 28, 1890 | F. Holz | Cutter Grinder | milling machines | |