4. Land vehicles
  5. Wheeled
  6. Extensible

Frank E. Evans

Inventor

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Collapsible golf bag cart

Land vehicles – Wheeled – Extensible
Patent

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Delayed phase changing agent for invert emulsion drilling fluid

Boring or penetrating the earth – Processes – Chemical reaction with earth formation or drilling fluid...
Reexamination Certificate

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Water based fluids comprising multivalent salts and low...

Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1533563

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