Title: Double-deck abacus of ten-bead
Application Number: 200520126361 Application Date: 2005.12.27
Publication Number: 000000000 Publication Date:
Approval Pub. Date: 2007.01.03 Granted Pub. Date: 2007.01.03
International Classifi-cation: G06C1/00;G09B19/02
Applicant(s) Name: Wang Chenggong Address:
Inventor(s) Name: Wang Chenggong
Attorney & Agent:
Abstract:
    A double-layer counting frame with ten abacus beads comprises a frame, shelves, and beads. Each shelf has ten abacus beads and is divided equally into upper and lower layers, i.e., the upper layer and lower layer both has five abacus beads. All the abacus beads can also be divided into two segments, three segment, etc., from the left side to the right side.
Time: 11
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