First two patent holders….
U.S. Patent No. X3306: Issued to Thomas L. Jennings in 1821 for a dry scouring method
U.S. Patent No. 8447X: Issued to Henry Blair for a corn seed planter
First two patent holders….
U.S. Patent No. X3306: Issued to Thomas L. Jennings in 1821 for a dry scouring method
U.S. Patent No. 8447X: Issued to Henry Blair for a corn seed planter