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1992-07-07 |
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Ground fault detector |
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1992-05-12 |
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Ring trip circuit for subscriber telephone |
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1991-02-19 |
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Battery feed circuit |
Kenji Takato, Kazumi Kinoshita, Yuzo Yamamoto |
1990-06-19 |
| 4912429 |
Operational amplifier |
Kenji Takato, Kazumi Kinoshita, Yuzo Yamamoto |
1990-03-27 |
| 4862309 |
Protection circuit for battery feed circuit |
Kenji Takato, Kazumi Kinoshita, Yuzo Yamamoto |
1989-08-29 |
| 4827505 |
Subscriber line interface circuit |
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1989-05-02 |
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Integrated ringing circuit and a ring trip circuit for the same |
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1989-05-02 |
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Battery feed circuit for telephone subscriber line |
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1986-05-13 |
