ERNEST J. ZEMKE, Petitioner, v. WORKMEN'S COMPENSATION APPEALS BOARD, W. S. SHAMBAN AND COMPANY et al. , Respondents. The petitioner, Ernest J. Zemke, worked as a maintenance mechanic for W. S. Shamban and Company in Newberry Park, California, prior to December 18, 1965. (1949) 95 Cal. App. 2d 443, 450 [213 P. 2d 11]; 2 Hanna, California Law of Employee Injuries and Workmen's Compensation (2d ed. [2] "Whether a disability results in whole or in part from 'the normal progress of a preexisting disease' (Industrial Indemn. We have also said that the W. C. A. B. is not entitled to rely on medical reports which it knows to be erroneous.

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