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In page Timeline of diving technology:
"
- 1934: René Commeinhes, from Alsace, invented a breathing set working with a demand valve and designed to allow firefighters to breathe safely in smoke-filled environments.[1]
- 1937: Georges Commeinhes, son of René, adapted his father's invention to diving and developed a two-cylinder open-circuit apparatus with demand regulator. The regulator was a big rectangular box between the cylinders. Some were made, but WWII interrupted development.[citation needed]
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