@patent{almendro,
    author       = {Almendro, Jos{\'e} L. and Mart{\'i}n, Jacinto and S{\'a}nchez,
                    Alberto and Nozal, Fernando},
    title        = {Elektromagnetisches Signalhorn},
    number       = {EU-29702195U},
    date         = 1998,
    location     = {countryfr and countryuk and countryde},
    langid       = {german},
    annotation   = {This is a \texttt{patent} entry with a \texttt{location}
                    field. The number is given in the \texttt{number} field. Note
                    the format of the \texttt{location} field in the database
                    file. Compare \texttt{laufenberg}, \texttt{sorace}, and
                    \texttt{kowalik}},
}