Like most history, there is always a bit of legend mixed in with fact and a fair amount of embellishment. That statement is even true when it comes to PL Robertson. If you live in Canada you know well the socket or square head screw, it’s standard across all provinces and all trades. Peter L. Robertson would often tell the story of how, as a screw salesman, a slotted screwdriver slipped during a demonstration and sliced his arm. Being both a salesman and an inventor, Robertson decided to invent a safer head for the standard screw. Although the more likely story is that Robertson sawRead More →