4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
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Drilling bucket apparatus for cast-in-place piles with expanded

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

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Drilling device for drilling and reaming of a hole

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

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Drilling tool

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

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Drilling tool

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

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Drilling tool with extendable elements

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

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