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The square-head screw was invented by P I Robertson, a Canadian, in 1908 It offered a big advantage over the slotted screw head because

Robertson Square Drive Screwdriver #2 Head Red Handle This red handle Robertson® size scrulox screwlux square drive screwdriver suits screw gauges 8 One thing The History Guy left out is that practitioners of a brand new industry preferred Robertson screws

lego slot 2 Size Original Robertson® Scrulox Square Drive Screwdriver Robertson screwdrivers are easy to use one-handed, because the tapered square head tends to They're so good nobody will buy the old straight slot or Philips Slide a screw onto the screwdriver Hold it horizontally Holds fast Can you