No single party seems to be able to prove ownership of 3.5 and 3.9 that would be valid to this day. (At least nothing that holds in court, or the situation wouldn't be what it is).
If the 3.1 source was "open" I imagine it would be possible fairly easily get to the 3.9 level and work from there.
But... who *holds/keeps* the 3.9 source? Still Haage-Partner or someone else?
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