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Definisi 'mainspring'
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English to English noun
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the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism |  | source: wordnet30
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The principal or most important spring in a piece of mechanism, especially the moving spring of a watch or clock or the spring in a gunlock which impels the hammer. Hence: The chief or most powerful motive; the efficient cause of action. | | source: webster1913
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