English RadioInterviews Interview: Dr. Oswald Sonntang (Germany) Interview about quality control. 10/16/2013 0 1685 Facebook Twitter Google+ Pinterest WhatsApp International Scientific and Professional Affairs Manager of Bio-Rad Laboratories – Bio-Rad Laboratories. Interview about quality control. https://www.infobioquimica.com/new/wp-content/uploads/2016/07/Oswald_Sontag_english_64.mp3