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FIRST MOTORCYCLE IN THE WORLD – SYLVESTER ROPER 1869!
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Sylvester Howard Roper, American Inventor
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AUTOPSY OF MOTORCYCLES: Sylvester H. Roper
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Harmon Sylvester Roper (1895-1919) - Find A Grave Memorial
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Kendi İcatları Yüzünden Ölen 10 Mucit - Oggito
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AUTOPSY OF MOTORCYCLES: Sylvester H. Roper
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