"Oskar Bider (12 July 1891 in Langenbruck – 7 July 1919 in Dübendorf) was a Swiss aviation pioneer." - (en.wikipedia.org 10.08.2021)
en
"Oskar Bider (12 July 1891 in Langenbruck – 7 July 1919 in Dübendorf) was a Swiss aviation pioneer." - (en.wikipedia.org 10.08.2021)
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