Execution of Debt Securities The Debt Securities shall be signed on behalf of the Partnership by the Chairman of the Board, the President or a Vice President of the General Partner and, if the seal of the General Partner is reproduced thereon, it shall be attested by its Secretary, an Assistant Secretary, a Treasurer or an Assistant Treasurer. Such signatures upon the Debt Securities may be the manual or facsimile signatures of the present or any future such authorized officers and may be imprinted or otherwise reproduced on the Debt Securities. The seal of the General Partner, if any, may be in the form of a facsimile thereof and may be impressed, affixed, imprinted or otherwise reproduced on the Debt Securities. Only such Debt Securities as shall bear thereon a certificate of authentication substantially in the form hereinbefore recited, signed manually by the Trustee, shall be entitled to the benefits of this Indenture or be valid or obligatory for any purpose. Such certificate by the Trustee upon any Debt Security executed by the General Partner on behalf of the Partnership shall be conclusive evidence that the Debt Security so authenticated has been duly authenticated and delivered hereunder. In case any officer of the General Partner who shall have signed any of the Debt Securities shall cease to be such officer before the Debt Securities so signed shall have been authenticated and delivered by the Trustee, or disposed of by the Partnership, such Debt Securities nevertheless may be authenticated and delivered or disposed of as though the Person who signed such Debt Securities had not ceased to be such officer of the General Partner; and any Debt Security may be signed on behalf of the General Partner by such Persons as, at the actual date of the execution of such Debt Security, shall be the proper officers of the General Partner, although at the date of such Debt Security or of the execution of this Indenture any such Person was not such officer.