Kernrechtsfrage
Whether the 4 February 1957 agreement expired on 6 May 2001 or 6 May 2006
Extrahierter Entscheid
The appeal court's finding of a true common intent bound the Federal Supreme Court; the appellant's contrary interpretation could not be reviewed.
Extrahierte Begründung
Contract interpretation based on subjective common intent is a factual finding. Since the lower court found an actual agreement on 6 May 2006, the Federal Supreme Court was bound absent an exception.