It was not until December 1942 that the demand valve was definitely improved in the way we know nowadays, when Frenchmen Jacques-Yves Cousteau (navy officer) and Émile Gagnan (engineer) met for the first time in Paris.
This came about when Frenchmen Jacques-Yves Cousteau (navy officer) and Émile Gagnan (engineer) met for the first time in Paris. It was not until December 1942 that the demand valve was definitely improved in the way we know nowadays.
It was not until December 1942 that the demand valve was definitely improved in the way we know nowadays. This came about when Frenchmen Jacques-Yves Cousteau (navy officer) and Émile Gagnan (engineer) met for the first time in Paris.
It was not until December 1942 that the demand valve was definitely improved in the way we know nowadays. This came about when Frenchmen Jacques-Yves Cousteau (navy officer) and Émile Gagnan (engineer) met for the first time in Paris.