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Charles Schwab Corp. (SCH) said that it has identified numerous instances of market-timing and late-trading activities in mutual funds run by the company and its subsidiaries. The San Francisco brokerage firm said Friday in its third-quarter filing with the Securities and Exchange Commission that it uncovered the trades as part of an internal review of its mutual-fund trading practices. That review apparently was sparked by SEC "examinations" of Charles Schwab and its U.S.