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Management Management Board Chairman of the Board of Management Martin Müller-Frerich Secretary Sabina Steinhage Phone: +49 (0)201 8317-230 E-Mail: sabina.steinhage@knauf-interfer.de     Member of the Board of Management Michael Steinkamp Secretary Martina Vogt Phone: +49 (0)201 8317-233 E-Mail: martina.vogt@knauf-interfer.de     Supervisory Board Dr. Albrecht Knauf (chair) Friedrich-Wilhelm Weitholz Ulrich Baum