| http://www.w3.org/ns/prov#value | - r supply means adapted to open when the pressure in the charging tank is reduced by opening the bleeder means, and the passage of gas from the gas tank to the chamber is closed, said chamber comprising a porous stone tube, the means for feeding gas from the gas tank to said chamber including a tube connected to the gas tank and projecting into said chamber and a rubber check at the end of the tube
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