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Images by GGK Basel Werbeagentur AG, Basel and Gebrüder Fretz AG, Zürich and Guido Stuber and Walter Ropélé and Serigraphie Albin Uldry, Hinterkappelen Bern
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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