Peter lymburner robertson biography

Peter Lymburner Robertson (December 10, – September 28, ) 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 by one Allan Cummings of New York City, U.S. Patent ,), it had never been developed into a commercial success because the design was difficult to manufacture.

Robertson's efficient manufacturing technique using cold forming for the screw's head is what made the idea a commercial success. He produced his screws (patented in Canada in ) in his Milton, Ontario, factory starting in The brand has been sold over the years, and the manufacturing for the present corporat