(under the class definition) Structure having (a) an inertial mass, other than that of the supported article, which cooperates with other structure to effect a desired vibration characteristic, (b) a particular relationship between the supported article and a movable part of the supporting structure whereby their masses combine to effect a desired vibration characteristic, or (c) a modified configuration of either the supported article or a movable part of the supporting structure, such configuration causing the mass thereof to cooperate with other structure to effect the desired vibration characteristic.
