Thanks for the information on the Voisin brevet FR386396. Unfortunately it is not available in Espacenet. Is there any way to get a scan of this undoubtedly interesting brevet ?
I did not know that the original Voisin - Farman was left in Vienna. There is a story
here
Quote:
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Schließlich kam das Flugzeug ins Heeresgeschichtliche Museum
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If we trust this story

the machine was delivered to the Museum and it is not stated that it was taken out again. Personally I do not think that the Voisin-Farman No.1 is a key-item in a Vienna museum as the machine had (almost) no connection to Vienna. Perhaps that might be the reason that the machine was 'reduced to produce' (or silently disappeared from the roster) because space in museums is always at a premium.
Knowing the thoroughness of these museums they have kept their records complete for this particular machine.
Cheers
Kees