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