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Images by Urs Grünig, Bern and Roland Aellig, Bern and Busag-Graphic AG, Niederwangen and Albin Uldry, Hinterkappelen and Theo Mauerhofer, Belp and Busag-Graphic AG, Niederwangen
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Sinalco
Ruedi Külling, Gockhausen
Trank AG, Zürich
1972
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