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Communications of the ACM

Communications of the ACM

The sumador chino

On a recent motor trip through Mexico, the writer came across an adding device which was referred to as a sumador chino (Chinese adder). A survey of the more available literature on the history of mathematics and on instruments of calculation has uncovered no reference to such a device. The purpose of this communication is to enlist the help of other members in bringing to light whatever may be known concerning the evolution and present status of the sumador chino.

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