Patents for Thomas Birch


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Patents for Thomas Birch
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	70,788	Nov. 12, 1867	T. Birch, A. Sowden	Improvement in grinding machine for circular saws
	104,695	Jun. 28, 1870	T. Birch, A. Crosby, J. Birch	Harvester