Questione giuridica chiave
Whether a remedy filed by fax is valid without an original signature and whether a grace period must be granted.
Decisione estratta
A remedy submitted by fax is invalid because the original signature is missing; no time limit for rectification is to be set.
Motivazione estratta
The court reaffirmed its case law that written-form requirements are not satisfied by fax transmission and that the defect is not curable by later supplementation.