MACFIE THE IRREPRESSIBLE UPON PATENT LAW. PATENT RIGHTS IN CONGRESS. 44 USES OF FLUOR SPAR. FLUOR SPAR IN GLASS MANUFACTURE. 4 PATENT OFFICE AFFAIRS. THE REPORT OF COL. W. A. ROEBLING CHIEF ENGI NEER OF THE N. Y. BRIDGE CO., scientific american, 1870-07-02
MACFIE THE IRREPRESSIBLE UPON PATENT LAW. PATENT RIGHTS IN CONGRESS. 44 USES OF FLUOR SPAR. FLUOR SPAR IN GLASS MANUFACTURE. 4 PATENT OFFICE AFFAIRS. THE REPORT OF COL. W. A. ROEBLING CHIEF ENGI NEER OF THE N. Y. BRIDGE CO., scientific american, 1870-07-02
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