Dec 29 1931
From The Space Library
U.S. Patent # 1.838,984 for Rocket Motor Aeroplane issued to Louis Berkowitz of New York on December 29, 1931. Filed Mar 20 1931
U.S. Patent # 1.838,984 for Rocket Motor Aeroplane issued to Louis Berkowitz of New York on December 29, 1931. Filed Mar 20 1931