4. Wells
  5. With heating, refrigerating or heat insulating means
  6. Heater surrounding production tube
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System for power supply to subsea installations

Wells – With heating – refrigerating or heat insulating means – Heater surrounding production tube
Reexamination Certificate

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System for recovering viscous petroleum from thick tar sand

Wells – With heating – refrigerating or heat insulating means – Heater surrounding production tube
Patent

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