资讯

insider.si.edu1月

American Propeller and Mfg Co. Paragon Propeller, fixed-pitch, two-blade, wood

An early predominant manufacturer in the United States, Spencer Heath's American Propeller and Manufacturing Company opened in 1909, and was first to use machines for mass production of aircraft ...
insider.si.edu14 天

American Propeller and Mfg Co. Paragon Propeller, fixed-pitch, four-blade, wood

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. An early predominant manufacturer in ...