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Hfeli DH side view. Hfeli DH reconnaissance aircraft of the Swiss Army Air Corps second series Aufklrungsflugzeug Hfeli DH der Fliegerabteilung der Schweizer Armee Serie Own photograph of an exhibit in the airforcecenter ch php langy Aviation Museum Flieger Flab Museum in Dbendorf Switzerland Sandstein Hfeli DH Aircraft at FliegerFlabMuseum