28(4)The seal of the Corporation may be engraved, lithographed, printed or otherwise mechanically reproduced on any security to which it is to be affixed and any signature on any such security or on coupons attached to it may be engraved, lithographed, printed or otherwise mechanically reproduced on them, and a seal or signature so mechanically reproduced has the same force and effect as if manually affixed and is valid and binding notwithstanding that the person whose signature is so reproduced ceased to hold office before the date or issue of the security.