Nippon Piston Ring Co., Ltd.Saitama-ken, Japan
Widex A/S
Inventis Ltd.Western Australia, Australia
Amplivox Ltd.Oxfordshire, United Kingdom
Happersberger Otopront GmbHBrandenburg, Germany
Starkey Laboratories, Inc.Minnesota, United States
Widex A/SDelhi, India
Rion Co., Ltd.Tokyo-to, Japan