§ 4459

The fact that an employee has suffered a previous disability, or received compensation therefor, does not preclude him from compensation for a later injury, or his dependents from compensation for death resulting therefrom, but in determining compensation for the later injury, or death resulting therefrom, his average weekly earnings shall be fixed at the sum which reasonably represents his earning capacity at the time of the later injury.

(Enacted by Stats. 1937, Ch. 90.)