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Chavatte considered this moss-box as more detrimental than useful, and not at all indispensable, and so substituted beton for it, as had previously been done by Mr. Bourg, director of the Bois-du-Luc coal mines. Details of dredge. Details of maneuvering lever. Mode of lengthening the axis of the dredge. Hooks for lifting the dredge bags. Arrangement of valves in the beton box.
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