Title: Nine-bead universal abacus with reinforced frame
Application Number: 200520031907 Application Date: 2005.09.15
Publication Number: 000000000 Publication Date:
Approval Pub. Date: 2006.10.18 Granted Pub. Date: 2006.10.18
International Classifi-cation: G06C1/00
Applicant(s) Name: Li Zhigang Address:
Inventor(s) Name: Li Zhigang
Attorney & Agent: zhang zhihe
Abstract:
    A nine-bead universal abacus with reinforced frame is the modification of the nine-bead universal abacus structure. It is fixedly equipped with 1 - 3 dabbers between the upper frame and the lower frame of the frame back. The dabber is made of finer hard metals. And the dabber is no higher than the base of the nine-bead universal abacus. The bottom surface of the nine-bead universal abacus after plus the dabbers makes the frame construction much firmer. When used or carried, it can assure that the shift rods wouldn
Time: 8
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