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| Patents for John Francis | |||||
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| Number | Date | Patentee | Title | Type | |
| 653,317 | Jul. 10, 1900 | C.A. Salzman | Convertable Apparatus | combination tools | |
| 684,433 | Oct. 15, 1901 | H.R. Isler | Differential Speed Mechanism | metal lathes | |