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