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