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Piasecki HUP Retriever

Utility helicopter
The Piasecki HUP Retriever/H-25 Army Mule is a compact single radial engine, twin overlapping tandem rotor utility helicopter developed by the Piasecki Helicopter Corporation of Morton, Pennsylvania. Wikipedia
Manufacturer: Piasecki Helicopter
First flight: March 1948
Number built: 339
Retired: 1958 US Army; January 1964 RCN; 1964 USN; 1965 French Navy