January 1, 1970
January 1, 1960
August 1, 1951
July 11, 1951
January 1, 1950
September 1, 1948
May 1, 1945
August 1, 1943
April 1, 1942
February 1, 1941
January 1, 1940
October 1, 1936
February 1, 1936
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August 1, 1933