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NK 1912
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1914 Continental Tires (prewar)
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1909 Al kinds of Continental Tyres, balls, and fabrics for balloons and flying machines
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Dutch Bicycle History: 1912
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Dutch Bicycle History: Programme 1913
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Paris Le Bol d'Or 1910: Léon Georget
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Stayer Paul Guignard behind Hofmann
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1912 The stolen Championship
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Piet Dickentman also uses Continental tyres
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Match behind tandems in France
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The most important sprinters and endurance drivers in the world