Patents Assigned to Dongguan Huayi Mastech Co., Ltd
  • GFCI tester
    Patent number: D628916
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: December 14, 2010
    Assignee: Dongguan Huayi Mastech Co., Ltd
    Inventor: Jun Tian
  • Voltage tester
    Patent number: D628917
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: December 14, 2010
    Assignee: Dongguan Huayi Mastech Co., Ltd
    Inventor: Jun Tian
  • Voltage tester
    Patent number: D629319
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: December 21, 2010
    Assignee: Dongguan Huayi Mastech Co., Ltd
    Inventor: Jun Tian
  • GFCI tester
    Patent number: D646598
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: October 11, 2011
    Assignee: Dongguan Huayi Mastech Co., Ltd
    Inventor: Jun Tian