Mr. Justice Strong delivered the opinion of the court. A brief review of the history and nature of the patent which the complainants allege has been infringed will aid materially in solving the questions presented by this appeal. On the fourteenth day of May, 1852, Dr. John A. Cummings, a dentist of Boston, filed in the Patent Office a caveat to protect an invention he claimed to have made, of certain new an…
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