SCIENTIFIC AMERICAN, New York, June 19, 1869  An inside pg. has the "Official List of Patents Issued by the United States Patent Office" which a includes: "90,646.--Electrographic Vote Recorder.--Tho. A. Edison (assignor to himself and Dewitt C. Roberts), Boston Mass." This device allowed a legislator to register a "yes" or "no" vote by turning a switch to the right or left. Edison was 22 yrs. old at the time.