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The problem is, Pangiotis, the text is not about covering plates, clips, tubular shrouds or couplers (where the terms may well have different applications). It's about terminals and cables. Try googling unscrewable terminal(s), anti-loosening terminal(s), anti-unscrewing terminal(s) and self-locking terminal(s)!
Cosa ha a che fare "antisvitante" con "auto-bloccante"?
A device for locking covering plates to the anchoring means of the walls to be covered is composed of one or more self-locking anti-unscrewing elastic ...
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37 mins confidence:
Explanation: This is the English for "antisvitante"