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Capa de Boy's second book of inventions

a novel ·

Boy's second book of inventions

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Discusses the development of such inventions as the seismograph, solar motor, wireless telegraphy, steerable balloons, and the discovery and applications of radium.

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Discusses the development of such inventions as the seismograph, solar motor, wireless telegraphy, steerable balloons, and the discovery and applications of radium.

M

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"Discusses the development of such inventions as the seismograph, solar motor, wireless telegraphy, steerable balloons, and the discovery and applications of radium."

— Margaret

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