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Who co-invented the Aqua-Lung, the first open-circuit scuba (now known as a diving regulator) to achieve worldwide popularity, with Émile Gagnan? The two went on to use the Aqua-Lung to film underwater.

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1. Who co-invented the Aqua-Lung, the first open-circuit scuba (now known as a diving regulator) to achieve worldwide popularity, with Émile Gagnan? The two went on to use the Aqua-Lung to film underwater.





 
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