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Technique: Illustration and Technique: Illustration by J. E. Wolfensberger AG, Zürich and J. E. Wolfensberger 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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