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| Patents for Charles Spengel | |||||
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| Number | Date | Patentee | Title | Type | |
| 524,380 | Aug. 14, 1894 | C.E. Francis | Veneer-press | veneer machines | |
| 614,804 | Nov. 22, 1898 | C.E. Francis | Implement for operating screws | veneer machines | |