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