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| Patents for R. E. Butterworth | |||||
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| Number | Date | Patentee | Title | Type | |
| 388,410 | Aug. 28, 1888 | J.T. Grzybowski | Cutter-head for grooving-machines | cutterheads | |
| 402,521 | Apr. 30, 1889 | J.T. Grzybowski | Machine for grooving lumber | matchers | |