The key task in development, in Mr Stern's opinion, is to open up the Quad's markets.

ECONOMIST: The World Bank

Unlike its competitors, Stern said the independent watch maker has resisted the temptation to open up "massively" in China because he believed it would damage the company's integrity.

CNN: Patek Philippe boss: Quality is more important than growth

It explores the idea of a low-fuel-use plane that uses open-rotor engines mounted on what is called a Pi-tail in the stern of the ship.

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