Today in 1937, US Patent 2084200 A was issued, an invention of Albert Karlson, for his “Barrel Tap.” There’s no Abstract, though it’s described this way in the application:

This invention relates to new and useful improvements in appliances pertaining to barrels, especially beer barrels, and to the methods of opening and drawing the contents from the latv ter; andit has” for its object to provide means, whereby said latter barrels may be opened and the beer drawn from these in a manner that will eliminate the comparatively great waste and spill of the contents, which now usually occurs in the opening of such barrels, while my device at the same time incidentally secures the retention in the barrels of the gases and fumes so essential to good and palatable beer.