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