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Portable ground thawing apparatus
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Patent number 6,408,843
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Issue date Jun 25, 2002
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Ground Specialties, Inc.
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Lawrence Bernard Olson
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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3558252
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Patent number 3,558,252
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Issue date Jan 26, 1971
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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3258058
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Patent number 3,258,058
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Issue date Jun 28, 1966
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES