Today in 1935, US Patent 2022952 A was issued, an invention of Abraham Cohen, assigned to Beer Control Systems Inc., for his “Beer Dispensing System.” There’s no Abstract, although in the description it includes this summary:

This invention relates to beer dispensing systems.

An object of this invention is to provide a system of the character described, provided with 5 highly improved means for returning the beer within the beer coils to the barrels and for flushing the coils with water and draining the water from the coils.