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Optical repeater monitoring system
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Patent number 4,710,976
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Issue date Dec 1, 1987
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Kokusai Denshin Denwa Co., Ltd.
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Hiroharu Wakabayashi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3637955
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Patent number 3,637,955
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Issue date Jan 25, 1972
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3482059
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Patent number 3,482,059
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Issue date Dec 2, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3189694
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Patent number 3,189,694
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Issue date Jun 15, 1965
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3182138
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Patent number 3,182,138
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Issue date May 4, 1965
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3172965
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Patent number 3,172,965
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Issue date Mar 9, 1965
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3059068
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Patent number 3,059,068
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Issue date Oct 16, 1962
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3049596
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Patent number 3,049,596
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Issue date Aug 14, 1962
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2843668
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Patent number 2,843,668
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Issue date Jul 15, 1958
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2611041
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Patent number 2,611,041
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Issue date Sep 16, 1952
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G01 - MEASURING TESTING
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2570912
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Patent number 2,570,912
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Issue date Oct 9, 1951
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2550782
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Patent number 2,550,782
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Issue date May 1, 1951
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H04 - ELECTRIC COMMUNICATION TECHNIQUE