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The GM logo is seen at the General Motors Warren Transmission Operations Plant in Warren, Michigan, Oct. 26, 2015. Rebecca Cook/Reuters

(Reuters) -- United Auto Workers said it extended the deadline for the ratification of a labor agreement with General Motors Co by a week to Nov. 20.

A majority of United Auto Workers members voted in favor of a new four-year contract with General Motors, but the pact had not been ratified yet because skilled trades workers voted it down.

GM and the union have been engaged in talks since July.