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Images by Theo Mauerhofer, Belp and Urs Grünig, Bern and Albin Uldry, Hinterkappelen and Busag-Graphic AG, Niederwangen and Messe Basel / Hauptabteilung Kommunikation
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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