VALUE OF PATENTS How Can I Best Secure My Invention? Preliminary Examination. To Make an Application for a Patent Foreign Patents. Rejected Cases. Reissues. Copies of Patents. MUNN dr C 37 Park Row New York. Back Page $1.00 a line. Inside Page 75 cents a line. JAY COOKE & Co. 20 Wall St. New York., scientific american, 1873-09-27
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