10 juil. 2020 · Among these was the Kalthoff Repeater, which was in fact developed in the seventeenth century, so more than one hundred years before the drafting of the Second Amendment.While it was a complex. The Kalthoffs were a prominent Danish-German family of gunsmiths during the 17th century, best known for the Kalthoff repeater — a rapid fire flintlock repeating rifle that could reach a rate of fire of 20–30 rounds/minute.