Today in 1935, US Patent 1991264 A was issued, an invention of Jesse F. Thomas and Claud R. Brown, for their “Beer Dispensing and Carbonating Apparatus.” There’s no Abstract, although in the description it includes this summary:

What is claimed: 1. A device of the class described comprising single fitting, said fitting having an inlet passage and an outlet passage, a pipe extending from one of said p through the other passage, fastening means on the pipe preventing downward displacement from the fitting, and cutting it direct communication between the passages, a pipe about the first mentioned pipe in communication with the other passage, means supported by the rest mentioned pipe at` its lower end in supporting contact with the second mentioned pipe and ports through one of said pipes and said means for discharge and intake purposes.

2. A device of the class described comprising a single fitting, pipes depending therefrom and spaced one within the other, the innermost pipe being a discharge pipe, fastening means at the upper end of the inner pipe preventing removal thereof downwardly from the fitting, the outermost pipe terminating below the upper end of spaced one within the other, the innermost pipe being a discharge pipe, fastening means at the upper end of the inner pipe preventing removal thereof downwardly from the fitting, the outermost pipe terminating below the upper end of the innermost pipe and providing passages between the same and the other pipe for the inlet of gas, a thimble extending into and supporting the outermost pipe at the lower end and into which the innermost pipe is screw-threaded, and said thimble having inlet passages communicating with the interior of the innermost pipe, the outermost pipe having outlet portions for gas communicating with the passages between the pipes, valve-controlled outlet means on the fitting contacting with the discharge end of the innermost pipe, said fitting having a chamber communicating with said passages between the pipes, and an inlet valve structure for the last mentioned chamber.