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Oil stimulation process
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Patent number 4,273,615
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Issue date Jun 16, 1981
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Farrokh Hirbod
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B09 - DISPOSAL OF SOLID WASTE RECLAMATION OF CONTAMINED SOIL SOIL
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Wind and wave energy generator
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Patent number 4,266,403
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Issue date May 12, 1981
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Farrokh Hirbod
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Ski skateboard
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Patent number 4,181,319
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Issue date Jan 1, 1980
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Farrokh Hirbod
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A63 - SPORTS GAMES AMUSEMENTS