ハインリッヒ・エルフレ
1. Heinrich ErfleHeinrich Erfle (1884–1923) developed the earliest type of wide-field eyepiece in 1917.
Read “Heinrich Erfle” on English Wikipedia
Read “ハインリッヒ・エルフレ” on Japanese Wikipedia
Read “Heinrich Erfle” on DBpedia
Read “Heinrich Erfle” on English Wikipedia
Read “ハインリッヒ・エルフレ” on Japanese Wikipedia
Read “Heinrich Erfle” on DBpedia
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