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Daily facts of science, technology & arts in history. Imprint: scihi.org/imprint/

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linkhttp://scihi.org/ calendar_today18-04-2008 17:38:27

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3 years ago

On October 26, 1861, German teacher and inventor Johann Philipp Reis, presented his telephone system at the ‘Physikalischen Verein zu Frankfurt am Main‘. scihi.org/johann-philipp…