Patents for John E. Roberts


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Patents for John E. Roberts
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	199,955	Feb. 05, 1878	A. Box	Improvement in screw hoisting-pulley apparatus
	632,678	Sep. 05, 1899	H. Dock	Tool for cutting screw-threads
	661,554	Nov. 13, 1900	J.E. Roberts	Rotary Cutter Head