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Old 04-20-2019, 07:05 AM   #25
Bob Gardner
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Join Date: Jan 2006
Location: The North of England
Posts: 1,734

Bonjour Pierre-Michel,

You are not in the least pedantic and you are a much valued contributor to this website. Please continue using intrados and extrados.

With kind regards,

Bob Gardner
Author; WW1 British Propellers, WWI German Propellers
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