Sheesh! Wim! I took my tuning exam on a shifting Keyboard piano! There were many companies that made these beasties. No, they didn't make very many of them, but there a few still in existance. Bird-Cage shifting keyboards? I've never seen one! Although that doesn't mean they made them. But, it is contradictory in their basic concept of "A cheap piano for the masses", which is what the Over-Damper pianos were, (for the most part)! Best Regards, Joe Garrett, RPT, (Oregon) Been There, Didn't Like It, So I'm Here To Stay! [G}
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