All certificates shall expire on the 31st day of December, of each odd numbered year following the date of issue and shall be nontransferable.

Added at 23 Ok Reg 2899, eff 6-25-06

Amended at 33 Ok Reg 15, eff 11-1-15 (emergency)

Amended at 33 Ok Reg 1893, eff 9-11-16

Amended at 37 Ok Reg 146, eff 10-2-19 (emergency)

Amended at 37 Ok Reg 2275, eff 9-11-20

Amended at 40 Ok Reg 1712, eff 8-25-23