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Start Over Subjects Pacemaker, Artificial ✖Remove constraint Subjects: Pacemaker, Artificial Titles Letter from Adrian Kantrowitz to Doris J. W. E. Escher ✖Remove constraint Titles: Letter from Adrian Kantrowitz to Doris J. W. E. Escher Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999

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