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3656836
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Patent number 3,656,836
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Issue date Apr 18, 1972
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G02 - OPTICS
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3550031
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Patent number 3,550,031
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Issue date Dec 22, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3504302
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Patent number 3,504,302
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Issue date Mar 31, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3493894
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Patent number 3,493,894
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Issue date Feb 3, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3462711
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Patent number 3,462,711
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Issue date Aug 19, 1969
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H01 - BASIC ELECTRIC ELEMENTS