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Start Over Subjects Surgical Procedures, Operative ✖Remove constraint Subjects: Surgical Procedures, Operative Titles Implantation of the first permanent partial mechanical heart ✖Remove constraint Titles: Implantation of the first permanent partial mechanical heart Languages No linguistic content ✖Remove constraint Languages: No linguistic content Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999

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