邮箱：protus@protus.com.sg

新加坡总部地址：3 Church St, #24-05 and #24-06 三星枢纽大厦 Singapore 049483

越南子公司地址：Room 401, 4th Floor, MB Bac Ninh Building, 
   No.24 Ly Thai To Street, Dai Phuc Ward, Bac Ninh City.