When did the father of George J. Gruen pass away ?
Dietrich Gruen Dietrich Gruen (February 22, 1847April 10, 1911), was a German born watchmaker who emigrated to the United States in the 1860s and later founded the Gruen watch Company.
John E. McMahon Major General John Eugene McMahon (December 8, 1860 – January 28, 1920) was a U.S. Army general. He was the father of World War II general, John E. McMahon Jr.