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| Patents for Carl Spengel | |||||
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| Number | Date | Patentee | Title | Type | |
| 263,104 | Aug. 22, 1882 | E.A. Bickel | Tool | combination tools | |
| 360,303 | Mar. 29, 1887 | J.E. Kessler | Gaging device for mortising-machines | mortising machines | |
| 410,994 | Sep. 10, 1889 | C. Sommer | Stave-dressing machine | barrel making machines | |
| 415,394 | Nov. 19, 1889 | L.F. Parks | Tenoning-machine | tenoning machines | |
| 475,553 | May 24, 1892 | W.A. Greaves | Lock for adjustable machine-table | bandsaws | |