I was about to ask the same thing. These posts by oggy a while back explain it a little.
https://hotcopper.com.au/threads/wave-ii-magnetic-booster-in-japan.3487926/page-18?post_id=25304373
https://hotcopper.com.au/threads/wave-ii-magnetic-booster-in-japan.3487926/page-111?post_id=25441551
I was about to ask the same thing. These posts by oggy a while...
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