The company: https://us.aqualung.com/pages/our-story
European regulators – historical review: http://www.vintagescubasupply.com/regseuro.html
Mechanism of scuba diving regulator in Wikipedia: https://en.wikipedia.org/wiki/Mechanism_of_diving_regulators
There is probably no more comprehensive source of knowledge than PADI Encyclopedia of Recreational Diving, chapter 3 from that source:
U2485039 patent by Émile Gagnan (1900 – 1984) and Jacques-Yves Cousteau (1910-1997). Gagnan worked earlier for liquid air company in France and Canada.
Z książki W oceanie życia Yves Paccaleta po polsku: