Today in 1967, US Patent 3305136 A was issued, an invention of Robert E. Harris, for his “Beer and Soft Drink Dispensing Assembly.” There’s no Abstract, although in the description it includes this summary:

The present invention relates generally to the dispensing of beverages, and more particularly to an assembly in which a simple source of refrigeration cools keg beer, soft drink concentrates, and domestic water that has been transformed into carbonated water in the assembly, with the cooled beer, as well as the concentrates blended with the carbonated water, being selectively dispensable from the assembly by use of a single source of carbon dioxide gas under pressure.