Gradus Jansen
- Born: 26 Sep 1860, Rheden
- Marriage (1): Maria Elisabeth Hubertina Körner on 30 Apr 1889 in Roermond, , Limburg, Netherlands
- Died: 25 Apr 1905, Roermond, , Limburg, Netherlands aged 44
Gradus married Maria Elisabeth Hubertina Körner, daughter of Hubertus Lambertus Körner and Ida Lemmens, on 30 Apr 1889 in Roermond, , Limburg, Netherlands. (Maria Elisabeth Hubertina Körner was born on 2 Jul 1855 in Roermond, , Limburg, Netherlands and died on 3 Feb 1935 in Roermond, , Limburg, Netherlands.)
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