The story
Victor Cupples died in Mount Vernon, New York in July 1941. Arthur Leon, who lived in New Rochelle, New York, died in December 1943, and his wife, Louise Heroy Leon, died five years later in February 1948.
The Platt & Munk publishing firm acquired Cupples & Leon in 1956.
From Wikipedia’s article on Cupples & Leon, shared under CC BY-SA 4.0.3
