Cleveland Screw Wrench Company
Cleveland Screw Wrench Company (Cleveland, OH) - American Machinist reports that in the first half of 1884, this company succeeded the company of Campfield & Sutliff. It further notes that Mr. Campfield is retiring from the company to start a wrench company in Sterling, OH. This was likely the Sterling Wrench Company. This company appears to have been viable from about 1884 to 1897.
DATAMP Patents for M. E. Campfield (not all apply to Cleveland Screw Wrench.)