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Carl Allen - drummer - was born in 1961.
Rick Allen - drummer - was born on 1963-11-01.
Rick Allen has been the drummer for Def Leppard all their career.
Actually, Tony Kenning was the original drummer for Def Leppard. Then Frank Noon was the drummer for just a few days. Rick Allen then became the permanent drummer for the band.
Carl Ferdinand Allen was born in 1811.
Carl Ferdinand Allen died in 1871.