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Re: Falltor
On a German site the names Falter and Faltermaier are traced back to Falltor, though it only calls it 'an attempt to explain'. It's on www.toni-benz.de/namefaltermaier.html
Falltor means: a gate (Tor) that closes ('drops down') vertically, a sluice, floodgate etc.
Looks like a pretty good attempt to me...
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