What are Robertson screws?

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But if you've ever cammed a screw-head slot, you know why it's not the only design The official history from the Robertson Screw

Find Robertson Screw stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection   Robertson invented the Robertson screw and screwdriver in 1908 slot or phillips or whatever Some Canadians don't even know the

wild hot 40 slot slotted A flat head screw can be Phillips, Slotted or any of the other type of drives Oops Slot head , 10:52 slug Join Date: Nov Interestingly, although they were always sold at a premium price, it is actually easier to make Robertson screws than slots screws, as slots involve a punch for