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3629489
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Patent number 3,629,489
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Issue date Dec 21, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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3405228
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Patent number 3,405,228
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Issue date Oct 8, 1968
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3340353
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Patent number 3,340,353
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Issue date Sep 5, 1967
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H01 - BASIC ELECTRIC ELEMENTS
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2785218
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Patent number 2,785,218
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Issue date Mar 12, 1957
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2688652
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Patent number 2,688,652
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Issue date Sep 7, 1954
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H01 - BASIC ELECTRIC ELEMENTS
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2589700
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Patent number 2,589,700
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Issue date Mar 18, 1952
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H01 - BASIC ELECTRIC ELEMENTS