was one of the few places where upper-class women could talk to strangers without risking their reputation. Since March 2021, Sprüngli has a cooperation with Swiss International Air Lines. Further reading Deborah Cadbury (2010): Chocolate Wars. The 150-Year Rivalry Between the World's Greatest Chocolate Makers. Public Affairs, e-book. References External links Official website Privately held companies of Switzerland Manufacturing companies based in Zürich Culture of Zürich Tourist attractions in Zürich Swiss chocolate companies Food and drink companies of Switzerland Food and drink companies established in 1836 Swiss companies established in 1836