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Technique: Illustration by Trank AG, Zürich and Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Trank AG, Zürich and Trank AG, Zürich and J. E. Wolfensberger AG, Zürich and Trank AG, Zürich from 1970s
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Sinalco
Ruedi Külling,
Trank AG, Züric
1972
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