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. Memorandum, — > : DIRECTOR, FBI_(7-15200) | CAATIN: FBI LABORATORY) ROM: SAN FRANCISCO (7-855)(P) SAN FRANCISCO Re San Francisco airtel dated April 17, 1974, des- cribing vacuum contents obtained in rear seat of 1974 AMC Hornet, 031-JZU. Referenced airtel was a cover letter for the vacuum cleaner bag contents. Those items were analyzed by the FBI Laboratory and it was determined that black silica slag particles were present therein. , Local investigation has developed a local industrial supplier who is familiar with the various types of black silica slag. He has §jndicated that upon viewing 4 sample of the slag he might be able to determine which industries 4n the Bay Area might use such a commodity. The Laboratory is requested to return 4 sample of the black silica slag particles to San Francisco so that the aforementioned investigation may be conducted. SAN FRANCISCO i AT SAN FRANCISCO, CALIFORNIA. Upon receipt © rom Bureau, Will dispig sample to pom 7/522 = 1938 Bow a7 MAY SO 1974 ~ a ‘ ce Buy U.S. Savings Bonds Regularly on the Payroll Savings Plan HDF By 2 - San Francisco