I've tried with no success to locate the WA referees for that surface-electrostatic-potential difference rust devices a few months back.

I've been away on work a lot but the real problem is that the mine closed some time ago (re-opening before long) and the people concerned worked (then) for the company doing the contract mining. I've tried but can't get anywhere.

Pity.

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Perhaps we should request new testimonials from the company concerned.

JohnW