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Patents for Robert Johnson
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
246,423Aug. 30, 1881E.H. SawinTenoning-machinetenoning machines
271,159Jan. 23, 1883C. ThompsonDrag-sawdrag saws
CA-38,064Jan. 04, 1892R. JohnsonMachine Rotatoire, Machine Soufflante, Pompe et Compteur a Eaurotary steam engines
1,410,189Mar. 21, 1922R. JohnsonCalipers, Spring-Calipers and the Likecalipers
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