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Security system
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Patent number 6,838,974
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Issue date Jan 4, 2005
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Matsushita Electric Industrial Co., Ltd.
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Kazuhisa Tsuzuki
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G08 - SIGNALLING
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Network surveillance unit
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Patent number 6,747,554
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Issue date Jun 8, 2004
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Matsushita Electric Industrial Co., Ltd.
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Mamoru Higashimura
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G08 - SIGNALLING
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Apparatus for monitoring
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Patent number 6,700,605
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Issue date Mar 2, 2004
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Matsushita Electric Industrial Co., Ltd.
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Tooru Toyoda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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