First patented in the USA by Kumaki Asari on September 27, 1938 but believed to have remained in production well into the 1960’s. It was a surface supplied diving apparatus and the air was either supplied with a manually operated pump or from compressed air tanks and a reducer. Instead of pumping the air into the suit as with a constant volume suit this apparatus used bladders at the sides of the mask where the air was pumped in, this configuration allowed the mask also to be used without a suit. When the diver demanded air the nrv’s in these bladders would open so the diver could inhale the air from them. When exhaling the nrv’s would close and the air escaped through an nrv in the chin of the mask.

Asari Senken Company


the scrapbook of diving history