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History management method
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Patent number 11,361,049
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Issue date Jun 14, 2022
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J-DATA CO., LTD.
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Koji Sasaki
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G06 - COMPUTING CALCULATING COUNTING
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History management method
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Patent number 10,678,883
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Issue date Jun 9, 2020
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J-Data Co., Ltd.
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Koji Sasaki
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G06 - COMPUTING CALCULATING COUNTING
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Portable telephone
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Patent number 8,346,296
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Issue date Jan 1, 2013
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J-Data Co., Ltd.
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Koji Sasaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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