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2831245
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Patent number 2,831,245
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Issue date Apr 22, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2831656
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Patent number 2,831,656
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Issue date Apr 22, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2710273
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Patent number 2,710,273
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Issue date Jun 7, 1955
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2664372
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Patent number 2,664,372
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Issue date Dec 29, 1953
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H01 - BASIC ELECTRIC ELEMENTS
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2386119
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Patent number 2,386,119
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Issue date Oct 2, 1945
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H01 - BASIC ELECTRIC ELEMENTS
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2066201
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Patent number 2,066,201
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Issue date Dec 29, 1936
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H01 - BASIC ELECTRIC ELEMENTS