Today in 1934, US Patent 1964235 A was issued, an invention of George H. Watson, for his “Beer Coil Cleaner.” There’s no Abstract, although in the description it includes this summary:

My invention relates to a beer coil cleaner and has for its principal object, the provision of a relatively simple, practical and inexpensive device that may be utilized for periodically cleaning and sterilizing the coils that are used for cooling beer as it is drawn from containers such as kegs or barrels.

Further objects of my invention are, to provide a beer coil cleaner that includes a container for a cleaning and sterilizing substance, said container having hot and cold water connections so that the cleaning and sterilizing substance may be forced through the beer cooling coils under pressure to thoroughly cleanse and sterilize the saine and the flow of hot and cold water into and through the container being controlled by a valve that is actuated by the conventional fitting that forms a part of the beer cooling apparatus and which is removably inserted in the beer kegs or containers.

A further object of my invention is to provide a beer coil cleaner that is adapted to receive the conventional form of tube that is inserted in the beer kegs or containers and which conveys the beer to the cooling coils.