bucket ladder

noun
    1. a series of buckets that move in a continuous chain, used to dredge riverbeds, etc, or to excavate land
    2. (as modifier)a bucket-ladder dredger
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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