the Tripolina chair (1877), patented by Joseph Beverly Fenby. Nowadays this chair is typically called a butterfly chair in Freak Hansen

You’ll probably recognize this campaign chair. It’s one of the most copied designs of all time. The BKF Chair (1938) aka The Hardoy chair designed by Grupo Austral (Antoni Bonet, Juan Kurchan, Jorge Ferrari-Hardoy) is modelled after the Tripolina chair (1877), patented by Joseph Beverly Fenby. Nowadays this chair is typically called a butterfly chair.