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Technique: Illustration and Technique: Illustration by Ruedi Külling, Gockhausen and Ruedi Külling, Gockhausen and Trank AG, Zürich and J. E. Wolfensberger AG, Zürich and Ruedi Külling, Gockhausen from 1970s
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Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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