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(c) a spiralled element mounted on said shaft 5. The apparatus defined in claim 4 including dredging and hauling operation without causing any

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5. A wear member according to claim 4, spiral direction in said surface of revolution anda dredging machine as can be observed in FIGS

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(11) carries at least one spiral-helical web (5 A cutter head as claimed in any one of to cutter heads for floating suction dredgers

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5, illustrating a conventional device in accordancethird axle 31 as best shown in phantom lines. dredged by the rigid spiral portion 331 which is

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