Langen is a town of roughly 36,000 in the Offenbach district in the Regierungsbezirk of Darmstadt in Hesse, Germany, between Darmstadt and Frankfurt am Main. Langen is headquarters to Deutsche Flugsicherung, and is also home to the Paul Ehrlich Institute, a Federal serum- and vaccine-making institution.
Source: CIA Factbook, Wikipedia
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