Today in 1968, US Patent 3410458 A was issued, an invention of Mack S. Johnston, for his “Beer Tapping Device.” There’s no Abstract, although in the description it includes this summary:

This invention relates to a beer tapping device and especially to an improved adapter for attachment in the beer outlet of a standard keg. It comprises a unit insertable from outside the keg and having a transition element forming a part of separate liquid and gas passageways. At least the liquid passage through the transition element has its lower end offset to take optimum advantage of the limited space available, while at the same time rendering the unit compatible with existing systems.