A brush has an elongate core, bristles fitted radially into this core, and at least one notch consisting of at least two secant faces defining by their intersection a trough line. The two faces are asymmetric and form an angle at any point of their intersection of between 60.degree. and 180.degree..

 
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> Magnetic bearing device with vibration restraining function, magnetic bearing device with vibration estimating function, and pump device with the magnetic bearing devices mounted thereto

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