2021 Relativity
2021 Relativity
Johanna Maria Helsdingen(5 Mar 1856 - )Theodora Bertha van Lottem
m. 21 Nov 1906, Rotterdam, ZH
Hendrik Engelman
Theodora Bertha Koppers
b. 20 Dec 1880
d. 22 May 1977
b. 28 Apr 1885, Rotterdam, ZH
d. 26 Sep 1947, Rotterdam, ZH