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| Patents for Richard E. Butterworth | |||||
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| Number | Date | Patentee | Title | Type | |
| 394,175 | Dec. 11, 1888 | J.T. Grzybowski | Cutter-head | cutterheads | |
| 396,399 | Jan. 22, 1889 | J.T. Grzybowski | Machine for grooving lumber | dado machines | |