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Thanks, Evan, you're quite right. I actually did know Phillips was only one of many types of cross-points. A bit like saying "xerox" instead of "photocopy". I didn't want to even get into all the hybrid fasteners I've seen in the catalogues -like heads that will take either slot, cross or square drivers. I've bumped into that one in AC electrical fixtures. Great for the ham fisted -if one driver happens to strip the head then maybe one of the others will still grab it.
And as long as we're picking nits, I must confess that the #0 (yellow) Robertson I mentioned is probably not included in Robertson's original patents. I didn't bother to check if it has since been formally recognized as a Robertson by industry. However, it is the only other square socket a consumer is likely to run into and consequently is sold alongside true Robertson drivers.
Gosh, this is getting a bit too fastenating.
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