Today in 1936, US Patent 2061240 A was issued, an invention of Oscar J. Leins, assigned to the Milwaukee Gas Specialty Co., for his “Beer Pump.” There’s no Abstract, although in the description it includes this summary:

This invention relates to an improvement in beer dispensers or pumps of the type designed for use by the consumers in drawing or dispensing beer or similar beverages from kegs, barrels or similar containers.