History of Square & Phillips screw drivers

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slot robertson screw Square drive & Phillips screw with Lube finish Lo-Root Features Type 17 shank slot cuts into material   Until the square drive screw was invented, nearly all screws were slot head or straight drive screws Square drives, also known as Robertson  Slot heads are rubbish to anyone who installs large numbers of fasteners and drivers on Phillips fasteners cam out very easily, usually making a

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