Vintage scuba
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Vintage SCUBA is a reference to the art of SCUBA diving using vintage style gear, which is generally defined at this time as equipment dating from 1975 and earlier.
[edit] Double Hose Regulators
The most striking and well recognized example of vintage SCUBA gear is the double hose regulator, a popular style of regulator since Jacques-Yves Cousteau and Emile Gagnan pioneered the first such design, the C45 Scaphandre Autonome, which was marketed in the USA(along with a tank and harness) as the Aqua-Lung.