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Digital composite tone alerting
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Patent number 4,972,466
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Issue date Nov 20, 1990
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Northern Telecom Limited
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Guy Quesnel
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Single frequency tone receiver
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Patent number 4,277,650
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Issue date Jul 7, 1981
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Northern Telecom Limited
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Inez F. Arend
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Digital signal detector
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Patent number 4,197,502
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Issue date Apr 8, 1980
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Motorola, Inc.
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Terence E. Sumner
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G01 - MEASURING TESTING
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Sampled signal detector
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Patent number 4,064,488
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Issue date Dec 20, 1977
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Motorola, Inc.
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Ronald Howard Chapman
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3435149
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Patent number 3,435,149
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Issue date Mar 25, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE