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3899711
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Patent number 3,899,711
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Issue date Aug 12, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3805106
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Patent number 3,805,106
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Issue date Apr 16, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3717785
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Patent number 3,717,785
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Issue date Feb 20, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3704511
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Patent number 3,704,511
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Issue date Dec 5, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3694686
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Patent number 3,694,686
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Issue date Sep 26, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3680184
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Patent number 3,680,184
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Issue date Aug 1, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3639803
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Patent number 3,639,803
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Issue date Feb 1, 1972
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3586900
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Patent number 3,586,900
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Issue date Jun 22, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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3534219
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Patent number 3,534,219
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Issue date Oct 13, 1970
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3421048
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Patent number 3,421,048
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Issue date Jan 7, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3134044
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Patent number 3,134,044
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Issue date May 19, 1964
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H01 - BASIC ELECTRIC ELEMENTS
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3050653
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Patent number 3,050,653
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Issue date Aug 21, 1962
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H01 - BASIC ELECTRIC ELEMENTS
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2899579
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Patent number 2,899,579
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Issue date Aug 11, 1959
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H01 - BASIC ELECTRIC ELEMENTS
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2850659
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Patent number 2,850,659
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H01 - BASIC ELECTRIC ELEMENTS
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2824251
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Patent number 2,824,251
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2801355
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Patent number 2,801,355
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2745035
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2728024
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2669675
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2315367
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Patent number 2,315,367
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H01 - BASIC ELECTRIC ELEMENTS