This action was brought by the appellant, Micromatic Hone Corporation, for alleged infringement by the appellee, Midwest Abrasive Company, of claim 1 of Calvert patent No. 1,908,218 for "Abrasive Stone Holder," issued May 9, 1933. The stone holder is used in conjunction with honing equipment for finishing internal cylindrical surfaces such as the cylinder bores of internal combustion engines. The District...
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