LIBROS DEL AUTOR: gilbert kivenson

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  • The Art and Science of Inventing
    Gilbert Kivenson
    The Independent Inventor Most persons have at some time in their lives invented somethin- perhaps a gadget for making some task easier or a method for increas­ ing the economy of an everyday operation. Aside from a certain degree of personal satisfaction, the great majority of these inven­ tions have never yielded their creators any amount of real ret...
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