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Electrically driven tuning fork with a vacuum - bending - amplifier, a driving coil, in order to keep the fork in oscillation, and a on the drive coil wound polarization winding, in order to polarize the core of the drive coil
Electrically driven tuning fork with a vacuum - bending - amplifier, a driving coil, in order to keep the fork in oscillation, and a on the drive coil wound polarization winding, in order to polarize the core of the drive coil
