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Technique: Illustration by Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Ruedi Külling, Gockhausen and Trank AG, Zürich and Ruedi Külling, Gockhausen and Ruedi Külling, Gockhausen
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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