PATRICK F. MERCIER, Petitioner, v. WORKERS' COMPENSATION APPEALS BOARD and CITY OF LOS ANGELES, Respondents In Bank. [16 Cal. 3d 713] Frank H. Batlin, Philip M. Miyamoto, Thomas J. McBirnie, Charles L. Swezey, Burt Pines, City Attorney, John T. Neville and H. John Wittorff, Assistant City Attorneys, and William G. Lorenzetti, Deputy City Attorney, for Respondents. OPINION CLARK, J. Petitioner seeks annulment of a workers' compensation award apportioning part of his permanent disability to a prior industrial injury. In 1970 petitioner, a Los Angeles police officer, suffered an industrial injury to his back. In 1971 petitioner was found to have suffered an industrially related heart disability occurring over the entire period of employment with the city, 1949 to 1971.

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