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Images by Trank AG, Zürich and Trank AG, Zürich and Trank AG, Zürich and Trank AG, Zürich from 1970s
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Sinalco
Peter Emch, Zürich
Trank AG, Zürich
1970
Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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