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Patents for R. E. Butterworth
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
388,410Aug. 28, 1888J.T. GrzybowskiCutter-head for grooving-machinescutterheads
402,521Apr. 30, 1889J.T. GrzybowskiMachine for grooving lumbermatchers
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