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Galvanic switch
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Patent number 5,214,400
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Issue date May 25, 1993
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Telefonaktiebolaget L M Ericsson
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Sture G. Roos
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H01 - BASIC ELECTRIC ELEMENTS
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Coordinate switch construction
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Patent number 3,997,858
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Issue date Dec 14, 1976
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Bell Telephone Laboratories, Incorporated
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Richard Miller Brownell
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H01 - BASIC ELECTRIC ELEMENTS
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3914724
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Patent number 3,914,724
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Issue date Oct 21, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3863044
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Patent number 3,863,044
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Issue date Jan 28, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3838239
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Patent number 3,838,239
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Issue date Sep 24, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3808566
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Patent number 3,808,566
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Issue date Apr 30, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3767869
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Patent number 3,767,869
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Issue date Oct 23, 1973
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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3764766
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Patent number 3,764,766
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Issue date Oct 9, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3763341
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Patent number 3,763,341
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Issue date Oct 2, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3753176
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Patent number 3,753,176
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Issue date Aug 14, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3746821
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Patent number 3,746,821
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Issue date Jul 17, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3743977
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Patent number 3,743,977
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Issue date Jul 3, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3735294
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Patent number 3,735,294
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Issue date May 22, 1973
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H01 - BASIC ELECTRIC ELEMENTS