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Portable power generating devices
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Patent number 7,465,147
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Issue date Dec 16, 2008
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Natural Forces, LLC
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Michael D. Platt
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Portable power generating devices
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Patent number 6,935,832
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Issue date Aug 30, 2005
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Natural Forces, LLC
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Michael D. Platt
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...