Patents for Henry C. Sergeant


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Patents for Henry C. Sergeant
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
147,402	Feb. 10, 1874	S. Ingersoll	Improvement in rock-drills	mining apparatus
RE6,292	Feb. 16, 1875	S. Ingersoll	Improvement in machines for drilling rock	mining apparatus