A good catch!
The French use Brevete for Patent(ed). SGDG is a bit like "Pat. pending" (it actually stands for Sans Guarantie Du Gouvernement).
and in case it helps:
Sonienie - not sure, but Sonner is to ring, as in ring a bell - so that may be the winder for the chime
Dovement - again, not sure. Doucement is gently/softly, so may be its loudness?
Peweil -no idea!
Dave