Musicman - The article you mention was based on 'current info' about fifteen years ago. There are a few recent updates to those formulae in this dating article. I was REALLY hoping you'd found a prototype!
You'll find lots of info around that site ( an article of Brian Hayden and Duets should be up soon) and also at The Concertina FAQ.
The Triumph and the Crane are the same system, Triumph being the SA name for the Crane.
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