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Start Over Subjects Palmer, B. Frank (Benjamin Franklin) ✖Remove constraint Subjects: Palmer, B. Frank (Benjamin Franklin) Subjects Patents as Topic -- legislation & jurisprudence ✖Remove constraint Subjects: Patents as Topic -- legislation & jurisprudence Titles Argument on behalf of the applicant: in the matter of the application of B. Frank Palmer, for the extension of letters patent, granted to him 4th November, 1846, for improvement in artificial legs ✖Remove constraint Titles: Argument on behalf of the applicant: in the matter of the application of B. Frank Palmer, for the extension of letters patent, granted to him 4th November, 1846, for improvement in artificial legs

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