Operating an aerial camera Wild Heerbrugg from a biplane Häfeli DH-5 (military) for aeronautical photogrammetry. Image captured in 1930.

https://commons.wikimedia.org/wiki/File:Handhabung,_Doppeldecker_H%C3%A4feli_DH-5_(Milit%C3%A4r)_f%C3%BCr_Aerofotogrammetrie_Aufnahmen,_000398822,_edit.jpg

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