John Rhodes is a Tele Vue employee and the company's representative on CloudyNights. In the following post he says
"Our Radians were introduced in 1998, they use multiple fully multicoated Lanthanum elements in each one."
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http://www.cloudynights.com/ubbthrea...v=#Post5290945>
John is not Al or David Nagler but he ought to be a decent source IMHO.