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Images by Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Ruedi Külling, Gockhausen and Ruedi Külling, Gockhausen and J. E. Wolfensberger AG, Zürich and Rolf Botzenhardt, Schlieren
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Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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