There is an old adage on Wall Street: no one rings a bell to signal a market top or bottom.

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Sir Roger used the original bell used in 1954 to signal the final lap.

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"If Citi is allowed to fail, and GM is allowed to fail, those are the kind of bell-ringing events that could signal a bottom, " Arnott said.

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The project (Bell Labs declines to disclose its cost) combined the work of physicists, app developers, signal processing experts and video engineers.

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