Draught beer (also called draft beer or tap beer) is literally beer that has been served from a cask, or in which it has been conditioned. Recently it has been used promotionally on canned or bottled beer to convince that these taste like they have come from a cask.
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... covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang.
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