const ArticleNumber &get_article_number() const { return art_nr; }
const std::string &get_name() const { return name; }
const std::string &get_description() const { return description; }
const ArticleNumber &get_article_number() const { return art_nr; }
const std::string &get_name() const { return name; }
const std::string &get_description() const { return description; }