A pneumatically operated active vibration damping device is disclosed, which comprises: a first and a second mounting member which are spaced apart from each other and are attachable to a two members of a vibration system; an elastic body elastically connecting the first and second mounting member; a...http://www.google.com/patents/US6264181?utm_source=gb-gplus-sharePatent US6264181 - Pneumatically operated active vibration damping device having air chamber whose volume is controllable
