Assertion: zeppelin's flight | /r/HasProperty | made on 1 july
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text: After modifications further trials were made on 23 and 29 June, and on 1 July a spectacular 12 hour cross-country flight was made during which it was flown over Switzerland to Zürich and then back to Lake Constance, covering 386 km (240 mi) and reaching an altitude of 795 m (2,600 ft).