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Boring or penetrating the earth
With means movable relative to tool to receive, retain, or...
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Shoe assembly with catcher for coring
Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent
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Soil sampler
Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Reexamination Certificate
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