Hugo Koch
Hugo Alexander Koch (9 March 1870, Delft – 3 March 1928, Düsseldorf) was a Dutch inventor who conceived of and patented an idea for machine encryption — the rotor machine, although he was not the first to do so. He is sometimes erroneously credited as the originator of the Enigma machine, although this has been shown to be the work of German engineer Arthur Scherbius.Koch filed for his rotor machine patent on 7 October 1919, and was granted Netherlands patent 10,700 (equivalent to ), held by Naamloze Vennootschap Ingenieursbureau Securitas in Amsterdam. No machine was built from his patents, and, in 1927, he assigned the rights to Arthur Scherbius, the inventor of the Enigma machine. Scherbius had developed the idea of rotor machine encryption independently from Koch, and had filed for his own patent in 1918. Bauer (1999) writes that Scherbius bought Koch's patents "obviously not because he did not own patents before; presumably he wanted to protect his patents". Provided by Wikipedia
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1by Koch, Hugo, 1843-1921
Published 1903
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2by Koch, Hugo, 1843-1921
Published 1912
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3by Koch, Hugo, 1843-1921Other Authors: “...Koch, Hugo, 1843-1921...”
Published 1899
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4by Koch, Hugo, 1843-1921
Published 1923
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5by Koch, Hugo, 1843-1921
Published 1901
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6by Koch, Hugo, 1843-1921
Published 1903
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11by Schmitt, Eduard, 1842-1913Other Authors: “...Koch, Hugo, 1843-1921...”
Published 1901
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12by Schmitt, Eduard, 1842-1913Other Authors: “...Koch, Hugo, 1843-1921...”
Published 1914
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13by Schmitt, Eduard, 1842-1913Other Authors: “...Koch, Hugo, 1843-1921...”
Published 1896
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14Published 1920Other Authors: “...Koch, Hugo, 1843-1921...”
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15Published 1904Other Authors: “...Koch, Hugo, 1843-1921...”
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16by Essenwein, August vonOther Authors: “...Koch, Hugo, 1843-1921...”
Published 1883
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17Published 1904Other Authors: “...Koch, Hugo, 1843-1921...”
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19by Wagner, Heinrich, 1834-1897Other Authors: “...Koch, Hugo, 1843-1921...”
Published 1904
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20Published 1899Other Authors: “...Koch, Hugo, 1843-1921...”
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