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All Patents of Type: rail drilling machines
Patents 1 - 3 of 3
First set of recordsLast set of records
428,516May 20, 1890A.R. PaulusRailway Track Drillrail drilling machines
464,673Dec. 08, 1891H.P. BradfordDrill for electric railwaysrail drilling machines
549,661Nov. 12, 1895A.A. SmithRatchet-drillrail drilling machines
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