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"SFA" Inspection Stamp
Most French propellers, and I'm told many other wooden components in French aircraft, are stamped with a small imprint with the letters "SFA", which I believe stands for some variation of "service" or "society", "fabriques" (?), and "aeronautique" or "aviation", etc.
Does anyone know the exact terms and any history of its significance? Is it in fact an inspection stamp or does it represent something different?
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