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2-Stage underreamer

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Actuator for an appliance associated with a ducted body, especia

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Actuator underreamer

Boring or penetrating the earth – Cutter element laterally shiftable below ground
Reexamination Certificate

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Advanced expandable reaming tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground
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Advanced expandable reaming tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground
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Advanced expandable reaming tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground
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Anchoring device and method for settling the device in the groun

Boring or penetrating the earth – Cutter element laterally shiftable below ground – With separable means holding tool collapsed above ground only
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Apparatus for drilling enlarged boreholes

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
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Apparatus for extracting minerals through a borehole

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
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Apparatus for rotary mining

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
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Bit for drilling an undercut hole

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent

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Bit torque limiting device

Boring or penetrating the earth – Cutter element laterally shiftable below ground – With shifting mechanism spring biased to operative position
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Bit torque limiting device

Boring or penetrating the earth – Cutter element laterally shiftable below ground – With shifting mechanism spring biased to operative position
Reexamination Certificate

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BIT torque limiting device

Boring or penetrating the earth – Cutter element laterally shiftable below ground – With shifting mechanism spring biased to operative position
Patent

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Bore head for deep-hole boring

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by relatively longitudinally movable...
Patent

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Bore hole enlarging arrangement and method

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Bore hole underreamer having extendible cutting arms

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reexamination Certificate

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Bore undercutting tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent

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Borehole opener

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reissue Patent

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Borehole opener

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
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