Who's Who In Knickerbocker Village History: David Diefenthaler

In the 1940 census David was listed as a coffee roaster living with his wife Ruth at 36 Monroe Street. Shortly after he joined the Air Force.
More about B. Fischer and Co. and the Diefenthaler family:

Following the death of Benedickt Fischer in 1903 the firm passed under the control of William H. Fischer, son of Benedickt, and Mr. Diefenthaler. Mr. Diefenthaler is survived by a widow, two sons, Richard and David A. Diefenthaler, ... SAN SALVADOR— The 1919-20 coffee crop in El Salvador is estimated at approximately 100000000 pounds. ... Mr. Diefenthaler is survived by a widow, two sons, Richard and David A. Diefenthaler, a flight officer with the Army Air Forces B. FISCHER and CO. 190 Franklin Street NEW YORK Name: David Diefenthaler Gender: Male Birth Date: 21 Jul 1913 Death Date: 26 Dec 1970