4. Wells
  5. With heating, refrigerating or heat insulating means
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Vacuum insulated converter for extending the life span of electr

Wells – With heating – refrigerating or heat insulating means
Patent

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Vacuum method for removing soil contaminants utilizing thermal c

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

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Variable frequency temperature limited heaters

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

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