Today in 1938, US Patent 2113887 A was issued, an invention of Thomas A. Hutsell, for his “Beverage Dispensing Faucet.” There’s no Abstract, although in the description it includes this summary:

My present invention relates to a method for the dispensing and measuring of effervescent or gas-charged liquids. A particular adaptation of my method lends itself particularly well to the dispensing of draft beer. Consequently for the sake of clearness of description I prefer to explain my method as employed in the dispensing of beer, it will be understood, it is believed, that any gas-containing or gas-producing liquid could be dispensed in a similar manner.