Three filling ports for wood pellets to a storage room in an apartment house in Zurich, Switzerland, pictured on September 14, 2014. (KEYSTONE/Gaetan Bally)
Drei Einfuellstutzen zum Holzpellet-Lager in einem Mehrfamilienhaus in Zuerich, Schweiz, am 5. September 2014. (KEYSTONE/Gaetan Bally)
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