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In page Timeline of diving technology:
"
- In San Diego, California, the first sport diving club was started by Glenn Orr, Jack Prodanovich and Ben Stone, called the San Diego Bottom Scratchers.[19] As far as it is known, it did not use breathing sets; its main aim was spearfishing.
- More is known of Yves Le Prieur's constant-flow open-circuit breathing set. It is said that it could allow a 20-minute stay at 7 meters and 15 minutes at 15 meters. It has one cylinder feeding into a circular fullface mask. Its air cylinder was often worn at an angle to get its on/off valve in reach of the diver's hand.[citation needed]
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