U.S.-China trade deal doubts lifts yen, A$ hits one-month low

TOKYO (Reuters) - Doubts over whether the United States and China will be able to reach a preliminary trade deal helped to lift safe-haven currencies such as the yen and the Swiss franc on Thursday, while pulling the yuan lower.Adding to pressure, Chinese retail sales, industrial output and investment data were weaker than expected, sending the Australian dollar, already knocked by soft local employment data, to a one-month low.U.S.-China trade negotiations have 'hit a snag' over farm purchases,..