Today in 1969, US Patent 3486512 A was issued, an invention of Anthony Marino, for his “Fluid Transport Line Cleaning Device and System.” There’s no Abstract, although in the description it includes these claims:

Fluid transport line cleaning device and system inclusive of upright container having inlets for passing cleaning material and water into container for mixing in container and outlet for delivering mixture from container under pressure. Pipe having valve controlled outlets and line couplings for selectively passing mixture from container through fluid transport lines coupled thereto such as syrup lines and beer lines having tap rods and associated faucets at bar counter locations. Portion of pipe for beer lines being rigid and arranged for wall mounting at bar counter for supporting a portion of pipe and container in upright position.