总部位于维也纳的Tumbleweed融资690万欧元，开发专有再入飞行器技术；初创公司声称具备反重力机器能力，融资轮细节待披露

原标题 · Vienna-based Tumbleweed raises €6.9M to develop proprietary reentry vehicle technologyStartup claims anti-gravity machine capability; funding round d…