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Technique: Illustration by J. E. Wolfensberger AG, Zürich and Ruedi Külling, Gockhausen and Werbeagentur Advico-Delpire AG, Gockhausen and Rolf Botzenhardt, Schlieren
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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