Simler Turn Signal for Automobile

ca. 1929

This turn signal was invented by Oscar J. Simler and patented in 1929. Aside from signaling turns, the device would signal for slowing when the brake was pressed, and signal a stop when the brake and clutch were both pressed. Turn signals were not offered to consumers purchasing cars until 1939, and they were more widespread in the late 1940s, when large numbers of car manufacturers offered them to consumers.