Piasecki HUP Retriever

Rarity: Common

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Invention

Domain

Science and technology

Knowledge cost

1

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What Wikipedia says

The Piasecki HUP Retriever or H-25 Army Mule, later UH-25, is a compact single radial engine, twin overlapping tandem rotor utility helicopter developed by the Piasecki Helicopter Corporation of Morton, Pennsylvania.

Excerpt from the Wikipedia article “Piasecki HUP Retriever”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bernie Stadiem, USN, Public domain, via Wikimedia Commons.