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[Radial motor on test block]
(Item)
![[Radial motor on test block]](https://digitalcollections.museumofflight.org/files/square_thumbnails/f453f5735a153402e0bedd576f678ab9.jpg "[Radial motor on test block]")
Photograph of a radial motor and propeller mounted on a test block, Dayton, Ohio, 1915.
Inscription on verso: "Dayton Ohio - 1915. Radial motor on test block."