At the beginning of the 20th century, William Peterson, a Danish immigrant in DeWitt, Nebraska, invented the first locking pliers in his blacksmith shop and began selling his product from the trunk of his car to farmers and people in the surrounding towns. He patented his new idea and called in Vise-Grip.
In 1934, Peterson Manufacturing Co. was formed to manufacture and market the Vise-Grip Locking tools. 50 years later, the Peterson family founded American Tool Companies, Inc. which acquired the IRWIN Tool Company in 1993.
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