EX-4.21
from S-3ASR
5 pages
Supplemental Indenture No. 18 Among Oklahoma Gas and Electric Company and Umb Bank, N.A., as Resigning Trustee and Bokf, Na, as Successor Trustee Dated as of April 26, 2018 Supplemental to Indenture Dated as of October 1, 1995
12/34/56