Yves le Prieur

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Commandant Yves Paul Gaston le Prieur (born 1885, died 1963) was a military man.

In 1924 he invented a hand-controlled self-contained underwater breathing apparatus. It delivered air at constant pressure without a demand regulator. He first experimented with it in 1926.

In 1946 he invented a new version of his breathing set. Its fullface mask's front plate was loose in its seating and acted as a very big and therefore very sensitive diaphragm for a demand regulator: see Diving regulator#Demand valve.

He also invented weapons.