By 1727, no fewer than 14 types of submarines had been patented in England alone. In 1747 an ______ inventor proposed an ingenio

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问题 By 1727, no fewer than 14 types of submarines had been patented in England alone. In 1747 an ______ inventor proposed an ingenious method of submerging and returning to the surface. (identify)

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答案unidentified

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