David Armbruster (swim coach) dating history

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David Alvin Armbruster Sr. (August 18, 1890-August 5, 1985) was an American swim coach who served as the first coach for the University of Iowa swim team from 1917-1958. In his long coaching career, he trained two swimmers who medaled in the Olympics, had fourteen of his swimmers capture NCAA titles, and led 75 of his swimmers to receive All American honors as collegians. He may be best known for helping to develop the "over the head" arm movement used in the modern butterfly, which he helped initially develop as a refinement to the breaststroke. Around 1934, Armbruster combined the over the head breaststroke recovery with the dolphin kick which later become the modern butterfly stroke. The butterfly stroke was not adopted as an official stroke separate from the breaststroke in swimming competitions until 1956. He is also known as one of several collegiate coaches who helped in the development and popularization of the flip turn, now used universally in training and competition.