On this date in 1835, the adjustable or screw wrench was patented via U.S. Census Bureau’s website

On this date in 1835, the adjustable or screw wrench was patented by Solymon Merrick of Springfield, Massachusetts. The modern looking wrench was soon followed by improved designs that are still in use today. There are 900 domestic establishments making the hand and edge tools that are the descendants of the prehistoric hammer stones and hand axes. The $5 billion a year industry employs some 23,000 people.
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