Questione giuridica chiave
Whether the appeal should be admitted against the cantonal judgment imposing joint liability under Art. 754 OR.
Decisione estratta
The appeal was unfounded; the cantonal judgment was upheld in substance.
Motivazione estratta
The appellants failed to show a federal-law violation. The Federal Court was bound by the earlier remand decisions, which had already confirmed a legally relevant damage and limited the remaining inquiry to fault and causation after 3 September 1991.