15.4. The internal by-laws of the Société may allow, subject to the conditions and on the documents determined therein, that a signature be affixed by means of an automatic device, that a signature be electronic, or that a facsimile of a signature be engraved, lithographed or printed. However, the facsimile shall have the same force as the signature itself only if the document is countersigned by a person referred to in section 15.3.