Michigan Compiled Laws, Chapter 120. Port Districts § 120.115

Sec. 15. An authority shall determine the form of the bonds of each series issued pursuant to section 14,  1 including any interest coupons to be attached thereto, the date of the bonds, the denomination of the bonds, and the place of payment of principal and interest, which may be at any bank or trust company within or without the state. The bonds of each series may be made redeemable before their maturity or maturities at the option of the authority, at a price and under the terms and conditions as may be fixed by the authority before issuance of the bonds. If an officer whose signature or a facsimile of whose signature appears on any bonds or coupons ceases to be an officer before delivery of the bonds, the signature or facsimile shall nevertheless be valid and sufficient for all purposes the same as if the officer had remained in office until the delivery. The bonds may be issued in coupon or in registered form, or both, as the authority may determine, and provision may be made for the registration of any coupon bonds as to principal alone and also as to both principal and interest, for the reconversion into coupon bonds of any bonds registered as to both principal and interest, and for the interchange of coupon and registered bonds.