Polo Men #3306X
Thomas L. Jennings (January 8, 1794 – February 13, 1876) was an African-American inventor, tradesman, entrepreneur, and abolitionist in New York City, New York. He has the distinction of being the first African-American patent-holder in history; he was granted the patent in 1821 for his novel method of dry cleaning. His technique called “Dry Scolding” combined with his business expertise yielded a significant personal fortune which he then re-invested into the Abolitionist movement in the United States.
His invention was registered by his owner as 3306. The X was added after a fire occurred at the Patent Office to indicate if the invention existed before or after the fire.