Are there any old shares in machine science listed?

Yes According to Cha official website, Electromechanical Development Technology Co., Ltd., referred to as Electromechanical, was officially listed on the Beijing Stock Exchange on the morning of June 30th, 2023. It is an overall solution provider with intelligent transportation technology and its high-end supporting equipment as the core, mainly for intelligent manufacturing, intelligent environmental protection, intelligent medical care and other fields.