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Electrical device for promoting oil recovery

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

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Electrical heater

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

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Electrical heater

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

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Electrode device for electrically heating underground deposits o

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

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