エルジン
His original jewelry business in Cleveland grew into the Ball Watch Company (currently headquartered in La Chaux-de-Fonds, Switzerland), which used other watch companies' movements, perfecting them and then reselling them. Ball Watch Company also ordered watches complete from other watch companies. Ball used movements from the top American manufacturers, Elgin, Hamilton, and Waltham, and switched to Swiss Avia movements as early as the 1940s in their wristwatches. The Waltham Watch Company complied immediately with the requirements of Ball's guidelines, later followed by Elgin National Watch Company and most of the other American manufacturers: Aurora, Hamilton, Hampden, E. Howard &amp; Co., Illinois, Seth Thomas, later on joined by some Swiss watch manufacturers: Audemars Piguet, Gallet, Longines, Record Watch, Vacheron Constantin.