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3711926
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Patent number 3,711,926
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Issue date Jan 23, 1973
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3706134
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Patent number 3,706,134
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Issue date Dec 19, 1972
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3705347
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Patent number 3,705,347
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Issue date Dec 5, 1972
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3623066
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Patent number 3,623,066
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Issue date Nov 23, 1971
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3564692
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Patent number 3,564,692
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Issue date Feb 23, 1971
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3521161
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Patent number 3,521,161
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Issue date Jul 21, 1970
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G01 - MEASURING TESTING
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3440531
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Patent number 3,440,531
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Issue date Apr 22, 1969
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G01 - MEASURING TESTING
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3295189
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Patent number 3,295,189
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Issue date Jan 3, 1967
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3169305
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Patent number 3,169,305
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Issue date Feb 16, 1965
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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2805471
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Patent number 2,805,471
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Issue date Sep 10, 1957
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H01 - BASIC ELECTRIC ELEMENTS