| CPC B60K 5/1225 (2013.01) [F16F 1/3842 (2013.01)] | 19 Claims |

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1. A mount bush comprising:
an internal pipe;
a middle pipe disposed outside the internal pipe;
a main rubber vulcanized between the internal pipe and the middle pipe; and
an external pipe fitted onto an external side of the main rubber,
wherein the middle pipe is configured to be variable in a length thereof.
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