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Images by Rolf Botzenhardt, Schlieren and J. E. Wolfensberger AG, Zürich and Rolf Botzenhardt, Schlieren and Rolf Botzenhardt, Schlieren and Trank AG, Zürich and Trank AG, Zürich and Rolf Botzenhardt, Schlieren from 1970s
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Sinalco
Ruedi Külling,
Trank AG, Züric
1972
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