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What is an apparatus consisting of a frame containing a number of parallel wires on which there are rows of beads?

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What is an apparatus consisting of a frame containing a number of parallel wires on which there are rows of beads which can be moved left and right?

posted Nov 10, 2017 by Amarvansh

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1 Answer

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Is in an abacus

answer Jul 13, 2019 by Comeback Tuesday
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