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The combination with a rotatable shaft having a given natural frequency of vibration, of a bearing in which said shaft is adapted to rotate, a support for said bearing having a natural vibration frequency different from that of said shaft, a floating ring between said bearing and said support, at least one pin on said support projecting freely into said ring, at least one pin on said bearing projecting freely into said ring, the pins on said support and said bearing being respectively angularly disposed in respect to each other and serving to hold said bearing against substantial rotation in respect to said support about the axis of said shaft, and vibration damping means between said bearing and said support.