Assertion: tower's observation deck | /r/HasProperty | equipped with closed platform
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text: Examples for this are the Henninger Turm, a grain silo with tower restaurant and observation deck in Frankfurt, the bell tower of Berlin Olympic stadium, whose platform is accessible by an elevator, the winding tower of the mining industry museum in Bochum, which has an open-air observation deck to which an elevator runs or a wind turbine in Holtriem wind park, which is equipped with a closed platform accessible over stairs.