<P> One of the more recent modifications to can design was the introduction of the "wide mouth" can in the late 1990s . The American Can Company, now a part of Rexam, and Coors Brewing Company have owned wide mouth design patent (number D385, 192) since 1997 . Other companies have similar designs for the wide mouth . Ball Corporation's from 2008 has a vent tube to allow direct airflow into the can reducing the amount of gulps during the pour . </P> <P> The SuperEnd from Crown Holdings launched in 2000 was designed to use 10% less metal in production than standard beverage ends . </P> <P> One variation was the press button can, which featured two pre-cut buttons--one small and one large--in the top of the can sealed with a plastic membrane . These buttons were held closed by the outward pressure of the carbonated beverage . The consumer would open the can by depressing both buttons, which would result in two holes . The small hole would act as a vent to relieve internal pressure so the larger button could then be pressed down to create the hole used for drinking the beverage . Consumers could also easily cut themselves on the edges of the holes or get their fingers stuck . </P> <P> Press button cans were used by Pepsi in Canada from the 1970s to 1980s and Coors in the 1970s . They have since been replaced with pull tabs . Used in Australia, locally known as "pop - tops", for soft drinks during the early 1980s . </P>

What is the hole in the coke can lid for
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