As to an employee who before the accident for which the employee claims compensation was disabled and drawing compensation under the terms of this title, the compensation for each subsequent injury shall be apportioned according to the proportion of incapacity and disability caused by the respective injuries which the employee may have suffered.

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Source: SL 1917, ch 376, § 26; RC 1919, § 9461 (8); SDC 1939, § 64.0404 (5); SL 2008, ch 278, § 27.