19. No document shall engage the liability of the Corporation unless it is signed by the chairman or, in cases determined by by-law of the Corporation, by an employee of the Corporation.
The Corporation may permit, by by-law, on such conditions and for such documents as it determines, that a required signature be affixed by means of an automatic device or that a facsimile of a signature be engraved, lithographed or printed. However, the facsimile shall have the same value as the signature itself only if the document is countersigned by a person authorized by the chairman.