The personal art collection of the late Microsoft co-founder Paul Allen could raise more than $1.4 billion when it goes under the hammer in November, in what is being billed as the largest auction sale in history.Visionary: The Paul G. Allen Collection will be offered at Christie's in New York, with all proceeds going to philanthropic causes, the auction house said.The auction will sell 150 works of art spanning 500 years of art history.
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