"Clemens Alexander Winkler (December 26, 1838 – October 8, 1904) was a German chemist who discovered the element germanium in 1886, solidifying Dmitri Mendeleev's theory of periodicity." - (en.wikipedia.org 08.04.2021)
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(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)