Bosch invented the first practical magneto, an early ignition electrical source, which provided the spark to ignite the fuel in most of the earliest internal combustion engines, and is still used in general aviation engines. Bosch's corporate logo to this date depicts the armature from a magneto. Bosch was an early manufacturer of Anti-lock Braking System (ABS), and as time passed, Bosch became a leader in such specialized fields as traction control systems (TCS), the Electronic Stability Program (ESP), body electronics (such as central locking, doors, windows and seats), and oxygen sensors, injectors and fuel pumps.
