Today in 1910, US Patent 954397 A was issued, an invention of Adolph C. La Budde, for his “Keg-Rinser.” There’s no Abstract, but here’s how it’s described:

The invention is an improvement in of all sizes, such as barrels, half barrel, quarter barrels and eighth barrels, and is designed to economize in labor and time; both in working the nozzle and the controlling valve or the water supply, and properly positioning the keg to receive the nozzle, as well as to make the rinsing more effectively

The invention in general consists of a water supply conduit having a nozzle and a controlling valve, a foot lever operable to simultaneously project the nozzle valve into the keg and open the valve, and rollers to support the keg over the nozzle, each roller tapering toward the center to conform to the keg and facilitate its movement to rinsing position.