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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 from 1970s
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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