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Floating seal for earth boring bit

Bearings – Rotary bearing – Roller drill bit
Patent

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Friction bearing and cone retention thrust system for a rock bit

Bearings – Rotary bearing – Roller drill bit
Patent

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Friction bearing assembly having a series of rings constituting

Bearings – Rotary bearing – Roller drill bit
Patent

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Friction bearing couple

Bearings – Rotary bearing – Roller drill bit
Patent

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