All Patents in class 173/56


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All Patents in class 173/56
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	5,951	Dec. 05, 1848	L.R. Bailey, J.T. Foster	Rock-Driller
	6,237	Mar. 27, 1849	J.J. Couch	Machinery for drilling rocks