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Tokyo stocks tumble as weak global data spook markets; yen gains

Japanese stocks were knocked hard on Thursday as weak global manufacturing activity and an Ebola health scare in the United States spooked world markets, sending investors scurrying to the safety of U.S. The gloom is seen keeping Europe on the defensive, with spreadbetters forecasting Britain's FTSE and Germany's DAX each to drop as much as 0.2 percent, and France's CAX to start 0.1 percent lower. Investors warmed to the yen after a slew of surveys showed German factory…