- Youyang delegates visited NMI, Netherlands on 9 Nor. 2018
- Youyang delegates visited Vectoflow, Germany, on 7 Nor. 2018
- Youyang delegates visited Streamwise, Swizerland . 8 Nor. 2018
- Yoshio Asanuma, executive officer of OVAL, Japan, visited Youyang on 20 March 2019