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Technique: Illustration by J. E. Wolfensberger AG, Zürich and Rolf Botzenhardt, Schlieren and Werbeagentur Advico-Delpire AG, Gockhausen and Ruedi Külling, Gockhausen and Trank AG, Zürich from 1970s
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Ruedi Külling, …
Trank AG, Züric…
1972
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