Title: Two-sided corresponding abacus
Application Number: 200610054882 Application Date: 2006.03.09
Publication Number: 1912794 Publication Date: 2007.02.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G06C1/00;G09B19/02
Applicant(s) Name: Wang Chenggong Address:
Inventor(s) Name: Wang Chenggong
Attorney & Agent:
Abstract:
    A new type of abacus is featured as setting front surface of abacus to be the same as back surface of it, using double color of completer beads to replace beam at meddle of traditional abacus, dividing completer double color beads to be top and bottom parts, corresponding digit of 0-10 in top and bottom parts separately to the same color and the same digit grade beads, setting beads to be eleven grades for corresponding them to digit of 0-10 accordingly, placing ten beads in each grade in order to use each bead to represent digit of one.
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