When was the claw hammer invented?

According to the book, One Good Turn: A Natural History of the Screwdriver and the Screw by Witold Rybczynski, the Romans, who invented forged iron nails, were also invented the claw hammer. Rybczynski goes on to explain:

"Pulling nails exerts heavy pressure on the handle, which risks being pulled out of its socket, or eye. Medieval English claw hammers sometimes had two metal straps that reinforced the connection to the handle. An American was responsible for the modern form of the claw hammer. In 1840, a Connecticut blacksmith, inspired by the adze, added a tapered neck that extended down the hammer handle, resulting in the so-called adze-eye hammer, which survives to this day. "

I found this very interesting and hope other do, too.