• 

  Itoh Denki

• 

  Rohde-Schwarz

• 

  HDL

• 

  HDW Howaldtswerke

• 

  Guhdo Hartmetall

• 

  LHD

• 

  Dutch Diamond Technologies

• 

  FRAM WEARGUARD HD

• 

  FRIEDRICH DECKEL

• 

  HDA