The Better Screw: A Canadian Grip

In 1908, Canadian P. L. Robertson invented the square-socketed screw to prevent 'cam-out'鈥攖he slipping that plagues other screw types. This superior grip made it highly efficient. While the Phillips head became more common globally, the Robertson screw remains widely preferred in Canadian construction and manufacturing for its reliability. #Canada#Innovation#Invention#Tools

https://en.wikipedia.org/wiki/Robertson_screwdriver