How can i gain more clientele?

I work part time for my father who has owned/operated a concrete construction company for the past 20+ years. Business was decent up until recently with the economy going south and the banks not lending. Majority of his large accounts don't have much work for him so I'm trying to find other ways for him to get business. He primarily works for large builders laying foundations and footings, not much private residential work. So far my only thought is to cold call local general contractors. Can anyone think up any ideas to get more business?

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Edited by Karen Shelton - October 24 2010 at 10:43pm