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3333059
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Patent number 3,333,059
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Issue date Jul 25, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3303277
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Patent number 3,303,277
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Issue date Feb 7, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3294897
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Patent number 3,294,897
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Issue date Dec 27, 1966
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3238292
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Patent number 3,238,292
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Issue date Mar 1, 1966
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3235656
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Patent number 3,235,656
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Issue date Feb 15, 1966
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3143598
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Patent number 3,143,598
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Issue date Aug 4, 1964
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3139484
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Patent number 3,139,484
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Issue date Jun 30, 1964
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...