in 1889 http://www.eti.kit.edu/english/1390.php http://www.eti.kit.edu/english/1390.php The invention of the electric motor 1856-1893 The invention of the electric motor 1856-1893 http://www.eti.kit.edu/english/1390.php http://www.eti.kit.edu/english/1390.php http://www.eti.kit.edu/english/1390.php source http://www.eti.kit.edu/english/1390.php