North America /
International Headquarters
1025 West Thorndale Avenue
Itasca, Illinois, USA 60143
Telephone: (630) 875-9800
24 Hour Emergency Telephone: 630-298-2460
Fax: (630) 875-1201
Email: info@therdigroup.com

Asia
Jin Du Mansion
3#, 1st District, Fangcheng Garden
Fang Zhuang
Beijing 100078, China
Telephone: 86-10-67644613
Fax: 86-10-67620684
Email: rdijgyao@public3.bta.net.cn