The designated hitter rule was put in effect in 1973.
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no
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José Morales - designated hitter - was born on 1944-12-30.
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Randy Johnson - designated hitter - was born on 1958-08-15.
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A DH is a designated hitter in baseball. The American League
uses DH's to bat in the lineup so that the pitchers do not need to
actually bat. In the National League there are no DH's and the
pitchers must bat just like the other position players.