Patents for Thomas Birch


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