Hans Christian August Hohwü was born on 20th April, 1751 in Gråsten (German:Gravenstein).
Jean-Baptiste-Modeste Billoquet was born on 20th April, 1784 in Saint-Nicolas d'Aliermont.
Perpétue Delépine was born on 20th April, 1794 in Saint-Nicolas d'Aliermont.
Adrien-François-Stanislas Lecul was born on 20th April, 1802 in Tourville-la-Chapelle.
Thestullien-Parfait Gosselin was born on 20th April, 1808 in Saint-Nicolas d'Aliermont.
Pierre-Jean-Baptiste Fouré was born on 20th April, 1829 in Saint-Nicolas d'Aliermont.
Victor-Édouard Piolaine was born on 20th April, 1835 in Dieppe (Seine-Maritime).
Augustine-Adélaide Lefebvre was born on 20th April, 1841 in Saint-Nicolas d'Aliermont.
Emil Welte was born on 20th April, 1841 in Vöhrenbach (Black Forest).
John Henri Aubert was born on 20th April, 1851 in Le Sentier.
Louis-Charles Binet was born on 20th April, 1858 in Saint-Nicolas d'Aliermont.
Marie-Emilia Huguenin (Elie) was born on 20th April, 1881 in Le Locle.
Cornelis Andriessen was born on 20th April, 1886.
Jean Adrien Piguet was born on 20th April, 1896 in Le Brassus.
Eduard Marius Piguet was born on 20th April, 1896 in Le Brassus.