{HEAD ~ A hydrodynamic coupling device} includes a hydrodynamic circuit having at least an impeller wheel and a turbine wheel and {TAIL ~ a lockup clutch} having an axially movable piston and a torsional vibration damper 
{ HEAD ~ A hydrodynamic coupling device } includes a hydrodynamic circuit having at least an impeller wheel and a turbine wheel and { TAIL ~ a lockup clutch } having an axially movable piston and a torsional vibration damper
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