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