Question juridique clé
Whether the buyer could refuse payment based on non-conforming delivery and hidden defects in the delivered mass goods.
Solution extraite
The appeal court upheld the lower court: even if the gear specification issue were set aside, the buyer could validly rescind as to the defective part and, because sorting out the defective units would be unreasonable, as to the remaining batch as well.
Motifs extraits
For a mass of separately sold items, rescission normally applies only to defective units, but total rescission is allowed when separating defective from non-defective items would cause substantial disadvantage and was not intended to leave the parties with different legal fates. Here, the hidden defect in the carbonization rods affected a substantial share of units, and selective sorting would have required disproportionate testing and use before resale.