A torsion damper comprises a main damper plate surrounding a hub, and a pre-damper mounted on one side of the main damper plate and having a housing which is coupled to the main damper plate for rotation with the latter, by coupling fingers each of which is engaged in a complementary aperture formed...http://www.google.de/patents/US5240458?utm_source=gb-gplus-sharePatent US5240458 - Torsion damper including a pre-damper having a housing with hooked tongues, in particular for a motor vehicle
