Today in 1974, US Patent 3790039 A was issued, an invention of Homer R. Zucconi, for his “Keg Tapping Assembly.” There’s no Abstract, but this application apparently continues from a previous filing, and it “relates to an attachment for enabling the use of a conventional tapping attachment for application to two different tapping systems, namely, one in which a single tapping connection is made at the top (central) hole axially of the keg, or to one in which a connection is made not only at the top central hole, but also at a bottom side hole, which double connections have been used for many years in the industry.”