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What is the author’s purpose in the book the aqua-lung

User Esamatti
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ir Liquide held the patent on the original "Aqualung" (also written as "Aqua-Lung" or "Aqua Lung") until the patent expired sometime around 1960 to 1963. The term "Aqualung", as far as is known, first appeared in print on page 3 of Jacques-Yves Cousteau's first book, The Silent World, in 1953.
User Vikmalhotra
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