Image: https://cdn.whensthebirthday.com/gallery/2017/1/frank-j-sprague/historia-de-la-ingenieria-y-la-tecnologia-frank-julian.jpg
Frank J. Sprague
professions.inventor de Estados Unidos
Image: https://cdn.whensthebirthday.com/gallery/2017/1/frank-j-sprague/historia-de-la-ingenieria-y-la-tecnologia-frank-julian.jpg
professions.inventor de Estados Unidos