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Polyester water clock has fluid filled hourglass with low density foam solid medium floating upwards to show time interval
Polyester water clock has fluid filled hourglass with low density foam solid medium floating upwards to show time interval
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机译:聚酯水钟具有充满液体的沙漏,低密度的泡沫固体介质向上浮动以显示时间间隔
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摘要
A polyester water clock has a transparent hollow glass, plexiglass or moulded hourglass body (1) with central constriction filled with both a water or oil fluid medium (2) and a lower density gas enclosing foam polyester or other foam solid medium (3).
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