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