THE PATENT CENTENNIAL CELEBRATION—APRIL 8 9 AND 10. THE UNITED STATES PATENT OFFICE AT WASHINGT MODEL HALL UNITED STATES PATENT OFFICE., scientific american, 1891-04-18

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THE PATENT CENTENNIAL CELEBRATION—APRIL 8 9 AND 10. THE UNITED STATES PATENT OFFICE AT WASHINGT MODEL HALL UNITED STATES PATENT OFFICE., scientific american, 1891-04-18

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