Make Sure Your Sign's UL Listed

By parvinclauss@parvinclauss.com January 05, 2012

Most Municipalities require a sign to be UL listed. What does that mean? Underwriters Laboratories Inc. originated in 1894 by electrical engineer William Henry Merrill shortly after he visited the Palace of Electricity and the Chicago World's Fair. Merrill observed that standards were ne...

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Blog: underwriters laboratories inc