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3878329
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Patent number 3,878,329
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Issue date Apr 15, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3624273
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Patent number 3,624,273
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Issue date Nov 30, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3482140
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Patent number 3,482,140
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Issue date Dec 2, 1969
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H01 - BASIC ELECTRIC ELEMENTS
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3478242
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Patent number 3,478,242
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Issue date Nov 11, 1969
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H01 - BASIC ELECTRIC ELEMENTS
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3204238
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Issue date Aug 31, 1965
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G01 - MEASURING TESTING
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3140415
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Patent number 3,140,415
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Issue date Jul 7, 1964
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G01 - MEASURING TESTING
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3047768
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Patent number 3,047,768
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Issue date Jul 31, 1962
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H01 - BASIC ELECTRIC ELEMENTS