Peter Lymburner Robertson (December 10, 1879 – September 28, 1951) was a Canadian inventor, industrialist, salesman, and philanthropist who popularized the square-socket drive for screws, often called the Robertson drive. Although a square-socket drive had been conceived decades before (having been patented in 1875 by Allan Cummings of New York City, U.S. patent 161,390), it had never been developed into a commercial success because the design was difficult to manufacture.
Peter Lymburner Robertson (December 10, 1879 – September 28, 1951) was a Canadian inventor, industrialist, salesman, and philanthropist who popularized the square-socket drive for screws, often called the Robertson drive. Although a square-socket drive had been conceived decades before (having been patented in 1875 by Allan Cummings of New York City, U.S. patent 161,390), it had never been developed into a commercial success because the design was difficult to manufacture.
Source: Wikipedia "P. L. Robertson" · CC BY-SA 4.0
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