GRAHAM, Presiding Judge.
An interference was declared between a patent issued to the appellant, Hugh F. Payne, No. 1,793,130, issued upon an application, No. 448,893, filed May 1, 1930, and an application of the appellee, Roy T. Hurley, Serial No. 435,461, filed March 13, 1930, for a similar invention.
The subject-matter of the invention is expressed in one count which is as follows: "In a spark plug, the combination of a body piece having a central opening...
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