California Code, Public Utilities Code - PUC § 142270

(a) The bonds, or each series thereof, shall be dated and numbered consecutively and shall be signed by the chairperson or vice chairperson of the authority and the auditor-controller-treasurer of the county, and the official seal of the authority shall be attached.

(b) The interest coupons of the bonds, if any, shall be signed by the auditor-controller-treasurer of the county.

(c) All signatures and the seal may be printed, lithographed, or mechanically reproduced, except that one of the signatures on the bonds shall be manually affixed.

(d) If any officer whose signature appears on the bonds or coupons ceases to be that officer before the delivery of the bonds, the officer's signature is as effective as if the officer had remained in office.