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Ryouichi Kaiwa
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Kanagawa, JP
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last 30 patents
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Patent Grant
Folding portable telephone apparatus
Patent number
6,807,275
Issue date
Oct 19, 2004
Matsushita Electric Industrial Co., Ltd.
Tetsuya Kubo
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Folding portable telephone apparatus
Patent number
6,748,243
Issue date
Jun 8, 2004
Matsushita Electric Industrial Co., Ltd.
Tetsuya Kubo
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Battery pack with water leakage detecting seal
Patent number
6,137,259
Issue date
Oct 24, 2000
Matsushita Electric Industrial Co., Ltd.
Tetsuo Hirabayashi
H01 - BASIC ELECTRIC ELEMENTS