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