Phelps Dodge Corporation. In matter of Phelps Dodge Corporation United Verde Branch and International Association of Machinists, Local No. 223, International Brotherhood of Boilermakers, Iron Ship Builders and Helpers, Local No. 406, International Brotherhood of Electrical Workers, Local No. B 657, and International Brotherhood of Carpenters and Joiners, Local No. 1061, cases nos. R-558 to R-561; certification of representatives, June 11, 1938.

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