4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
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Cavern well completion method and apparatus

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

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Collapsible cutterhead for drilling upward

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

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Collapsible rock head

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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Combination mill and drill bit

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

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Combined drill and underreamer tool

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

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Concentric expandable reamer and method

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Plural selectively shiftable cutter elements
Reexamination Certificate

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Counterboring device for wells

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

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