4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Vertical

Robert G. Sullivan

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Method of lining a vertical mine shaft with concrete

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Vertical
Patent

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Optical sensors for cue ball detection

Games using tangible projectile – Billiards or pool – Ball
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1716038

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