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Anyone remember the old Reyrolle plugs?, these were made of cast Aluminium?, and used a Scraping Earth contact arrangement.
They were banned here in 2000, we are still
removing them from Industrial sites, I got a...
from Trumpy

Mike do you have a photo of these or even one lying around? Sounds wicked from your description! What about the design was responsible for these plugs being so dangerous [Linked Image]