Today in 1909, US Patent 927893 A was issued, an invention of John R. Steiger, for his “Beer-Pipe-Cleaning Apparatus.” There’s no Abstract, although in the description it includes this summary:

My invention relates to a new and useful beer pipe cleaning apparatus and consists in providing means whereby a circulation of the cleansing material may be made through the pipes. It further consists of means for directing the flow of the cleansing material first in one direction and then in the other through the pipes. It further consists in providing an ejector for forcibly directing water and air through the pipes.