Grenkamp was born on July 1, 1896 and died in 1943 in Natzweiler-Struthof concentration camp, aged about 47. Recorded occupations: Esperantist, writer, opinion journalist, editing staff, editor and translator. Country of citizenship: Poland. Fields of work: Esperanto, opinion journalism and editing.
This image of Grenkamp's signature comes from Wikimedia Commons (Wikidata P109 signature file). Its licence is recorded as Public domain, with the file credited to Samuel Kornfeld. It is linked to the person through Wikidata property P109 (signature), which ties a documented individual to a specific archived file. We show the file as published and do not redraw or retouch it. Deceased 1943: low publicity-rights risk.
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