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while I know they exist and I can point to an interesting collection I don't know the history of how they were invented and when:

https://www.celofixings.com/1663-self-tapping-and-self-drill...




Thanks! But this just seems to be an empty page with a cookie clickwrap extortion box on it?


this is what it says to me:

> Self-tapping and self-drilling screws

> CELO is leading the self-tapping and self-drilling screw market. > CELO's self-tapping and self-drilling screws offer the widest selection for installations of joining metals, PVC profiles and aluminium sheets.

> In this section you will find our screws in all sizes, recesses, head types and coatings.

and then pages over pages of a catalogue.

it was the first catalogue link searching for "self taping and self drilling screws"




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