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LRS244954 Heinrich Hertz, c.1890 (b/w photo) by Krewaldt, Robert (fl. 1890); Archives Larousse, Paris, France; (add.info.: Heinrich Rudolf Hertz (1857-94); celebrated German physicist; first scientist to produce electromagnetic waves artificially; important scientific achievement leading to development of radio, TV and radar;); German, out of copyright.
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TOP26957315
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達志影像
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RM
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