Thomas Edison signed his last patent application on 6th January 1931. The great American inventor died later that year. Edison had received his first patent on 1st June 1869 for a voting machine, Electrographic Vote-Recorder.
Thomas Edison signed his last patent application on 6th January 1931. The great American inventor died later that year. Edison had received his first patent on 1st June 1869 for a voting machine, Electrographic Vote-Recorder.