File:PSM V29 D198 Gravity clock escapement mechanism aided by weight.jpg
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![File:PSM V29 D198 Gravity clock escapement mechanism aided by weight.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/04/PSM_V29_D198_Gravity_clock_escapement_mechanism_aided_by_weight.jpg/502px-PSM_V29_D198_Gravity_clock_escapement_mechanism_aided_by_weight.jpg?20100915060153)
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