Edison Portland Cement Stock signed by Thomas Edison 1899

1899 Edison Portland Cement Temporary Scripophily Stock Certificate (serial #3) issued to and signed by Thomas Edison. Classic umbrella signature of Thomas A Edison on back of this certificate number 3 for 10,000 shares. Thomas Edison was America's most prolific inventor. In addition to his well-known inventions of the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb, Edison spent considerable effort in industrial processes, including iron ore processing, electrical generation equipment, and cement manufacturing. His greatest mistake was in promoting DC electrical distribution rather than AC. Certificate is in VF+ condition. Signature is lightly pen cancelled.