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Patents for John David Caldwell
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
714,098Nov. 18, 1902J.D. CaldwellShingle Edging Machineshingle machines
882,233Mar. 17, 1908J.D. CaldwellShingle-butt-cutting machineshingle machines
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