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Images by Busag-Graphic AG, Niederwangen and Roland Aellig, Bern and Theo Mauerhofer, Belp and Albin Uldry, Hinterkappelen and Jean-Benôit Lévy from 1970s
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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