4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Tsukamoto Seiki Co., Ltd.

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Axial retainer for a cutter in a rotary drill bit

Bearings – Rotary bearing – Roller drill bit
Patent

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Composite nozzle for earth boring and bore enlarging bits

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Pressure compensator for rotary earth boring tool

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent

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Pressure tight joint for a large diameter casing

Pipe joints or couplings – Particular interface – Tapered
Patent

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Rotary shaft seal for drill bit cutters

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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