DE: Walter Mittelholzer (l.) und Mechaniker Ernst Bissegger (r.) mit einer Junkers A 20 vor der Werft der Ad Astra Aero AG am Zürichhorn
EN: Walter Mittelholzer (l.) and mechanic Ernst Bissegger (r.) with a Junkers A 20 in front of the Ad Astra Aero AG shipyard on the Zürichhorn.

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