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A variant of the category of French drip coffee pots is the group of so-called Bohemian coffee pots, manual zero-bypass flat bottom coffee makers made out of porcelain only, including Karlsbad coffee makers (1878), Bayreuth coffee makers (2007), the Walküre cup filter (2010): 128  and the Walküre aroma-pot (2015). In contrast to French drip coffee pots, they all use a special double-layered conically cross-slitted strainer made from through-glazed porcelain as well as a water spreader with six (or, in the larger models, more) large round holes to ensure an even water distribution and reduce the agitation of the coffee bed, a method sometimes also called cake filtration. In particular before World War I, but still up to the advent of the Espresso machine in the 1950s, they were very popular in the Viennese coffee house culture. The special kind of drip coffee they produce is called a Karlsbader (‘Karlsbad coffee’). In Vienna, the Kleiner Schwarzer (confusingly also called Mokka or Piccolo), a black coffee without milk or sugar, was often prepared in Karlsbad coffee makers as well, hence they were sometimes incorrectly also called Vienna coffee-making machines. Once manufactured by many porcelain manufacturers, demand gradually dropped and eventually production stopped when electrical coffee makers became more and more common, so that Karlsbad coffee makers were only available on the used market for a couple of decades. However, experiencing a renaissance since about the millennium as part of the so-called third-wave of coffee one manufacturer restarted production of them. They are also used in restaurants and by connoisseurs, coffee sommeliers, coffee roasters and in coffee tasting laboratories.