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Apparatus and method for obtaining undisturbed soil core samples

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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Apparatus and methods for sponge coring

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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Apparatus and methods for sponge coring

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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Apparatus and methods for sponge coring

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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Apparatus for downward displacement of an inner tube within a co

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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Apparatus for extracting cores

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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Apparatus for recovering core samples at in situ conditions

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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