The Pre-existed must simply be a disability for which partial permanent could be made if it were industrial: An injured worker to be entitled to SIBTF benefits, his prior permanent disability need not have caused actual earnings loss; the Court cited in Brown v.WCAB & SIF 36 CCC 627 (1971): “Although the prior disability need not be reflected in the form of loss of earnings, if it is not, it must be of a kind upon which an award for partial permanent disabilities could be made had it been industrially caused. This is necessary to distinguish it from a “lighting up” aggravation, or acceleration of the pre-existing physical condition where the employer is to be held liable for the whole.”(36 CCC 635).