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Subscriber circuit
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Patent number 6,310,953
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Issue date Oct 30, 2001
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Fujitsu Limited
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Kazuhiro Yoshida
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Ring trip deciding circuit
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Patent number 5,402,482
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Issue date Mar 28, 1995
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Fujitsu Limited
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Kazuyuki Minohara
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Ring trip detection circuit
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Patent number 5,335,271
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Issue date Aug 2, 1994
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Fujitsu Limited
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Kenji Takato
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Hybrid circuit
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Patent number 5,128,992
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Issue date Jul 7, 1992
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Fujitsu Limited
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Kenji Takato
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Ground fault detector
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Patent number 5,113,426
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Issue date May 12, 1992
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Fujitsu Limited
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Kazumi Kinoshita
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Battery feed circuit
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Patent number 4,935,960
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Issue date Jun 19, 1990
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Fujitsu Limited
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Kenji Takato
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Operational amplifier
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Patent number 4,912,429
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Issue date Mar 27, 1990
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Fujitsu Limited
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Kenji Takato
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H03 - BASIC ELECTRONIC CIRCUITRY
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