英语词汇“sprague frank julian”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	sprague frank julian
释义	Sprague Frank Julian Sprague S0668500 (sprāg), Frank Julian 1857-1934. American engineer and inventor. He developed the first electric trolley system (1887) and made advances in electric elevator design.
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Sprague Frank Julian