A Patent for a President

Dd you know that Abraham Lincoln had a strong interest in new technology and is the only United States President to hold a patent?

Thomas Jefferson was the third President of the United States and invented but did not patent a swivel chair, spherical sundial, moldboard plow and cipher wheel.

As President James Garfield lay dying of an assassin's bullet, Alexander Graham Bell hurriedly invented a crude metal detector in an unsuccessful attempt to locate the fatal slug.

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