2/13/2012

Makers of concrete storm shelters have seen an increase in demand in tornado-prone areas. Wieser Concrete in Wisconsin has partnered with a Colorado engineering firm and now makes storm shelters that weigh up to 80,000 pounds. Minnesota-based Crest Precast has also seen an uptick, and last year provided 14 shelters -- that can hold 120 people each -- to Caterpillar.

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