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Male Johann Helmers Janssen Click to view Johann Helmers Janssen in the family tree View timeline for this person's branch of the family tree

Johann was born on November 23rd, 1869 in Abickhafe, Lower Saxony, Germany.  Johann's father was Ede Janssen and his mother was Triene Frieden Trauernicht.  His maternal grandparents were Friede Evers Trauernicht and Gretje Margaretha Harms Ross. He had a brother and a sister, named Gerd and Gretke.  He was the oldest of the three children.

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