...2 Patentanspruch 1 hat in der Verfahrenssprache des Klagepatents in der im Einspruchsverfahren geänderten Fassung folgenden Wortlaut: "A replaceable wear part (13, 22, 22a, 32, 41) for mounting on a leading edge (12, 27) of a working tool (10, 27, 30), said leading edge and said wear part having co-operative guide formations (16, 18) extending generally perpendicular to the leading edge and which provide...