Company History



  • 1985 Formed Nam Fung Company in Hong Kong, started to manufacture metal contact domes (metal domes).
  • 1986 Joint Venture with Mel Bowman Assoc. USA. Mel Bowman Assoc. is Engineering & Marketing house in USA whose expertise is in metal contact parts (metal domes).
  • 1987 Reformed the Company and named as True Tone Industries Ltd., continuing in metal contact domes manufacturing.
  • 1989 Firstly purchased our own factory plant in Kwun Tong Industrial Area in Hong Kong.
  • 1990 Started to import materials directly from Japanese and American material suppliers to upgrade the quality.
  • 1993 Moved and expanded our factory plant in the same industrial area.
  • 1994 Installed Electrical Discharge Machine (E.D.M.) to upgrade our tooling.
  • 1996 Installed Japan and Taiwan made high speed Automatic Presses to upgrade products stability and to ensure quality.
  • 1998 Imported Gold-plated, Silver-plated and Nickel-plated stainless steel materials from Japan to manufacture metal contact domes to fulfill particular customers’ requirements.
  • 1999 The third time to move and expand our factory plant to meet our target on annual output up to 30 million pieces of metal contact domes.
  • 2000 Especially imported various measuring and testing equipment such as life testing, conductive testing equipment, etc., to meet various electrical/membrane switch manufacturers’ requirements.
  • 2002 Certified ISO 9001:2000 on the Manufacturing of Metal Contact Domes for the Electronic Industry by TUV on February 2002.
  • 2003 The fourth time to expand our factory plant to improve production management.
  • 2005 Adding numbers of high speed Automatic Presses to increase another 30% productivity. All our products have been tested to be complied with the RoHS by SGS Hong Kong Ltd.
  • 2009 Efforts to upgrade our technology, technique and equipment for tools fabrication.
  • 2013 Property invested, company offices renovations.
  • 2018 Certified ISO 9001:2015 on the Manufacturing of Metal Contact Domes for the Electronic Industry by TUV.