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n4freepatentsonline.
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isa:191008177
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Provision is also made for coding of the parts, e.g. by arms of different colour, size, shape or imprint, again to provide abaci or dice of varying numeric or visual or spatial pattern.In this invention the counters or balls of the traditional abacus become arms or counters or balls which are attached to or may be placed on an axle in such a way that they rotate.
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