• 1821 - LEJUMEAU - Mémoire sur l'ausculatation
• 1823 - HAUS - Auscultation in Bezug auf Schwangerschaft
• 1839 - NAEGELE - Treatise on Obstetric Auscultation
• 1845 - JOYNES - Observations on OBS Auscultation
• 1847 - McCLINTOCK - Auscultation in Labour
• 1893 - HAMILTON - Application of Graphics to FHR Sounds
• 1903 - DOHRN - Auskultation in der Schwangerschaft
• 1922 - DROSIN - Locating FHR Sounds
• 1924 - FALLS - Improved Head Stethoscope for FHR_
• 1930 - HYMAN - Irregularities of the Fetal Heart
• 1930 - LEFF - Stethoscope for FHR Ausculatation
• 1957 - LISTER - Foetal Distress and Neonatal Asphyxia
• 1961 - WOOD - Foetal Distress
• 1963 - DONALD - Foetal Cephalometry by Ultrasound
• 1965 - KUBLI - Early Diagnosis of Foetal Distress
• 2013 - CAMPBELL - Short History of OBGYN Sonography

1821-LEJUMEAU

1823 - HAUS

1893-HAMILTON

Fetoscope

1918-Fetoscope

DeLEE-HILLIS Fetoscope

1924-FALLS Fetoscope

1930-HYMAN

1930-LEFF

1940-WATERS

FHR Monitor