translate English to French: Where the opposing party has to furnish proof of use or show that there are proper reasons for non-use, the Office shall invite him to provide the proof required within such period as it shall specify.
Si l'opposant doit apporter la preuve de l'usage de la marque ou de l'existence de justes motifs pour son non usage, l'Office l'invite à le faire dans un délai qu'il lui impartit.