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