A method of supplying electrical power to at least one device at a tree of an underwater fluid extraction well is disclosed. The method comprises using magnetic resonance coupling for wirelessly transmitting power from a supply to each device.
https://app.acclaimip.com/pdf/9lqhCWC8zBZtWqFshbzMGgbzagB2x12G2g6Rpvc/US9097089B2
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