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+--- Thread: Abacus = Scientific Calculator (/showthread.php?tid=36846)
Abacus = Scientific Calculator - Rob - 2011-01-25
http://webhome.idirect.com/~totton/soroban/THE%20ABACUS%20HANDBOOK.pdf
Well, the abacus sure can be used for complicated calculations. This version, the Soroban, is the Japanese one, but you get the point.