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1957-3-22br/ br/ Portland Chamber of Commerce members view a model trailer on display at the Mid-States corporation factory in McMinnville on a visitation with the Chamber of Commerce here. Nearly 40 member sof the Portland chamber visited here on Thursday on a tour of business establishments and the new industrial park. Here they gather at the huge mobile home factory where work is starting on the new construction of the first trailers produced in the new northwest plant.