Title:
【考案の名称】暗算練習用そろばん
Document Type and Number:
Japanese Patent JPH0650025
Kind Code:
Y2
Inventors:
Hisako Kato
Application Number:
JP1852088U
Publication Date:
December 14, 1994
Filing Date:
February 15, 1988
Export Citation:
Assignee:
Hisako Kato
International Classes:
G06C1/00; (IPC1-7): G06C1/00
Domestic Patent References:
| JP4865998A | ||||
| JP6232424U | ||||
| JP5871833U | ||||
| JP4869092U |
Attorney, Agent or Firm:
Takahiko Higashiyama
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