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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 Rolf Botzenhardt, Schlieren and Ruedi Külling, Gockhausen and Trank AG, Zürich and Ruedi Külling, Gockhausen and Rolf Botzenhardt, Schlieren
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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