4. Cutlery

Norman H. Still

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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 spider for use in supporting casing during upward dr

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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Ski-type stabilizer for drilling apparatus, and method of use

Cutlery
Patent

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Underground drilling and casing method and apparatus

Boring or penetrating the earth – Processes
Patent

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Profile ID: LFUS-PAI-P-473840

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