Ruben Salomon Kleinkramer, born 18 October 1903 in Strijen, was a son of Jozeph Kleinkramer and Roosje Haas. He married Elizabeth Helena Cohen in Rotterdam on 25 March 1937, a daughter of Salomon Cohen and Sophia van Straten. She was born in Rotterdam on 18 December 1910 .
Ruben Salomon Kleinkramer was educated as a chemical engineer and was a pharmacist by trade. In 1919 he lived shortly in Rotte…