Appareil propre e la direction des aerostats plans annexes e la demande d'un brevet pour une duree de 15 ans . Patent drawing submitted by Sourbieu & Pradel shows two views of an apparatus for steering or controlling the direction of balloons by hand-cranking a series of four rotating sails. (Source: AG Renstrom, LC staff, 1981-82). Date 1852.
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TOP23823649
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達志影像
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