English Henry Fitz Cited by user Doug Coldwell on 11 Apr 2021 Henry Fitz was an American engineer, scientist, locksmith, optician, and inventor.
English Heinrich Erfle Cited by user Citation bot on 31 May 2020 Heinrich Erfle (April 1, 1884, Dürkheim – April 8, 1923, Jena) was a German optician who spent most of his career at Carl Zeiss.
English Heinrich Erfle Cited by user Citation bot on 31 May 2020 Heinrich Erfle (April 1, 1884, Dürkheim – April 8, 1923, Jena) was a German optician who spent most of his career at Carl Zeiss.