| http://www.w3.org/ns/prov#value | - her characterized in that the memory means is an EEPROM designed according to the IIC architecture and is connected to the digital control device via an ICC bus, which comprises a serial data line and a clock line and the control device is arranged to form a control signal for the switch means with a frequency which is a submultiple of the frequency of the a.c. field, and whose phase relative to t
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