- Training on operation of common measuring instruments 2017-06-15
- Products ( Rohde & Schwarz Co.) Promotion Meeting. 2017-06-15
- A lecture was held on Radio Monitoring Receivers 2017-06-13
- International Marine Hi-tech exhibition ( Zhuhai）in Apr.2016 2017-06-10
- June.2015. Product Promotion Conference 2017-06-09
- Participated in DSA 2012 held in Malaysia in April, 2012. 2017-05-21
- Participated in EUROSATORY 2012 held in France in June, 2012 2017-05-03
- Participated in UDT 2013 held in Hamburg/Germany 2017-05-03
- participated in Shanghai International Marine Engineerin 2017-05-03
- participate in PACIFIC 2013 held in Australia in Oct.2013 2017-05-03
- Jiayuan Hongsheng Science & Technology (Beijing) Limited was 2017-06-17
