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