S.L. 597.4 · Trademark Rules (S.L. 597.4)
S.L. 597.4 Art. 44Language.
PART III
(1) Any communication, including an international application, for transmittal to the International Bureau through the intermediary of the Comptroller shall be in English.
(2) Any communication concerning an international application or an international registration addressed to the International Bureau by the Comptroller shall be in English.