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Federmanometer. PlattenfederManometer Man Schffer Budenberg Federmanometer In Dr Freiherr von Rll Hrsg Enzykloppie des Eisenbahnwesens Siebenter Band Seite Abb Schffer Budenberg Prototypes or at least early versions were likely produced in Bernhard Schffer's factory in Magdeburg Prlatenstrae PDold Check categories November de