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Separator counter
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Patent number 5,101,767
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Issue date Apr 7, 1992
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Owen C. Williams
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G06 - COMPUTING CALCULATING COUNTING
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Automatic trapping system
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Patent number 4,917,048
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Issue date Apr 17, 1990
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John Beattie
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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3921588
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Patent number 3,921,588
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Issue date Nov 25, 1975
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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3110388
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Patent number 3,110,388
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Issue date Nov 12, 1963
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G06 - COMPUTING CALCULATING COUNTING