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Earth auger and method for driving piles and the like by means o

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Pivoted about substantially longitudinal axis
Patent

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Enhanced diameter clean-out tool and method

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Plural cutter elements longitudinally relative movable into...
Patent

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Enlarged bore hole drilling method and apparatus

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

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Enlarging well bores having tubing therein

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

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Excavation tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Pivoted about substantially longitudinal axis
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Expandable and contractible rotary well drilling bit

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

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Expandable bit

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

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Expandable drill bit

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Plural cutter elements longitudinally relative movable into...
Reexamination Certificate

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Expandable drill bit

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

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Expandable earth boring apparatus using impregnated and...

Boring or penetrating the earth – Cutter element laterally shiftable below ground
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Expandable gage bit for drilling and method of drilling

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

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Expandable reamer

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

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Expandable reamers for earth boring applications

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

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Expandable stabilizer with roller reamer elements

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

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Expandable well drilling tool

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by cam or gear axially rotatable...
Patent

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Expansible tool for reaming frustoconical undercuts in cylindric

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