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3636991
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Patent number 3,636,991
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Issue date Jan 25, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3615283
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Patent number 3,615,283
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Issue date Oct 26, 1971
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2450974
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Patent number 2,450,974
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Issue date Oct 12, 1948
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H01 - BASIC ELECTRIC ELEMENTS
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2433346
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Patent number 2,433,346
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Issue date Dec 30, 1947
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H01 - BASIC ELECTRIC ELEMENTS