Resonant Transformer

["Dan Kunkel" <dankunkel-at-hotmail-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Obviously a Tesla Coil is a resonant transformer. But are there any others, 
or is the Tesla Coil a stand alone in the field. If are there any others, 
what frequencies do they operate at and what are there uses?

Dan
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