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Patents for James Hay
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	108,326	Oct. 18, 1870	J.C. Butterfield, J. Hay	Improvement in trip-hammers
	RE4,470	Jul. 18, 1871	J.C. Butterfield, J. Hay	Improvement in trip-hammers

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