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Dear Mr. Williams,
Thank you for using History Hub. The following information is from the National Archives at San Francisco:
“The U.S. Magistrate Court in San Luis Obispo County is part of the Western Division of the U.S. District Court for the Central District of California. The seat of the Central District is in Los Angeles and the records go to the RIverside FRC/National Archives at Riverside. That said, magistrate criminal cases from 1971 are unlikely to have survived. Most are destroyed after five years unless the case was moved to the District Court criminal docket because it was charged as a felony.”
Best of luck in your endeavor.