Stamping signature on notices or bills.

~Every notice or bill, which isrequired by this Actoi by any rule made thereunder to bear the signature of the Chairman or of any other Trustee or of any officer or servant of the Board, shall be deemed to be properly signed if it bears a facstmile of the signature of the Chairman or of such other Trustee or of such officer or servant, as the case may be, stamped thereupon.