4. Wells
  5. With heating, refrigerating or heat insulating means
  6. Electrical heater in well
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Down hole oil well heater employing electro-thermal paper

Wells – With heating – refrigerating or heat insulating means – Electrical heater in well
Patent

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Downhole thermoacoustic device

Wells – With heating – refrigerating or heat insulating means – Electrical heater in well
Patent

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