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In page 1947 World Series:
"At the direction of Commissioner Happy Chandler, the Series, for the first time, used six umpires to make calls.[2] Series from 1918 through 1946 used four umpires in the infield, with two alternates available for security. However, no alternate had ever been needed, and Chandler believed that enlisting these umpires to make calls along the outfield lines would put these men and their skills to better use. However, not until 1964 would the additional two umpires rotate into the infield during the course of the Series.
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