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Images by Heliodruck GmbH, Winterthur and Katrin Aerni and Meierhofer und Zöllig, Winterthur and Bon Genie / Grieder, Genève and Kurt Eckert, Tobias Strebel
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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