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Search: Repository Francis A. Countway Library of Medicine Remove constraint Repository: Francis A. Countway Library of Medicine Subjects History of Medicine Remove constraint Subjects: History of Medicine Subjects Medical instruments and apparatus Remove constraint Subjects: Medical instruments and apparatus Date No date Remove constraint Date: No date
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1. Patent release from Elisha Perkins to Benjamin Goodhue, circa 1796

2. Patent release from Elisha Perkins to Isaac Backus, 1796