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In 1940 Churchill designed and patented the swim fin improving it from the earlier version made by Louis de Corlieu in 1935. With skin-diving's low popularity in America, he sold under a thousand pairs. He thought of the idea from seeing Tahitian boys using the same concept. They would use soft rubber and metal bands shaped like a fish tail.
Churchill kept the idea in the back of his mind, and in 1940 introduced what would become a bodysurfing equipment standard: the Churchill "Duck Feet" swim fin. In another breakthrough, around the same time, Santa Monica lifeguard Cal Porter taught himself how to ride at an angle across the wave face rather than straight to the beach.
Swimfins, swim fins, diving fins, or flippers are finlike accessories worn on the feet, legs or hands [1] and made from rubber, plastic, carbon fiber or combinations of these materials, to aid movement through the water in water sports activities such as swimming, bodyboarding, bodysurfing, float-tube fishing, kneeboarding, riverboarding, scuba diving, snorkeling, spearfishing, underwater ...
The combination of de Corlieu's fins with le Prieur's breathing apparatus in 1935 was a significant development towards the free-swimming scuba diver. [2] In 1939, de Corlieu finally started mass production of his fins, which until then he had made in his apartment in Paris.
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1962: On 15 October 1962, James S Christiansen files a patent for a device enabling a pair of swimming fins to be coupled together to reduce fatigue and cramping during prolonged swimming. Although the detachable coupling converting the separate swimming fins into a monofin-like design is granted US patent 3165764A [ 7 ] on 19 January 1965, it ...
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