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A Robertson screw is kind of like a Phillips head screw, except it has a tapered square hole in the screw head to fit the screwdriver into. It was invented before the Phillips head. It is mostly used in Canada and in a few industry-specific products, although supposedly industrial testing proves it works better than a Phillips or slot head screw.
Sorry, I just read "One Good Turn," so now I'm full of facts about screwdrivers.
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