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