Today in 1899, US Patent 619978 A was issued, an invention of Henry Mock, for his “Tap for Beer or Other Kegs.” There’s no Abstract, but the description states that the “invention relates to a tap which is readily changeable from one beer or other keg to another and which insures a tight joint between the tap and the keg, so that all loss of liquid or gas is prevented and the pressure on the liquor necessary for drawing it is easily sustained.
