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Keywords: Grumman J4F used as seaplane hull testbed in 1948.jpg A Grumman J4F-2 Widgeon seaplane used as the testbed for the Martin P5M Marlin hull in 1948 The Widgeon was fitted with a downscaled Marlin hull http //www navy mil/ah_online/department_arch html U S Navy All Hands magazine http //www navy mil/ah_online/archpdf/ah194809 pdf September 1948 p 36 1948 U S Navy PD-USGov-Military-Navy Grumman G-44 |