If you are a true Canadian, the only screwdrivers you enjoy using are Robertson (black, red, green, or yellow handles denote the size of screw). Oddly, the square-hole fastener, patented in 1909 by Ontarian P.L. Robertson, never caught on in the U.S. Blame, according to lore, falls to a failed agreement between the inventor and Henry Ford. Consequently, our American neighbours still cling to the Phillips screw, a far inferior choice.
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