Experimental Ballooning. THE BLAKE TRANSMITTER. THE BLAKE TELEPHONIC TRANSMITTER. MECHANICAL INVENTIONS. MODIFICATION OF THE REYNIER AND WERDERAIANN ELECTRIC LAMP. BY GEO. M. HOPKINS., scientific american, 1879-11-01
Experimental Ballooning. THE BLAKE TRANSMITTER. THE BLAKE TELEPHONIC TRANSMITTER. MECHANICAL INVENTIONS. MODIFICATION OF THE REYNIER AND WERDERAIANN ELECTRIC LAMP. BY GEO. M. HOPKINS., scientific american, 1879-11-01
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