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proposal in 1946 and a production engine in 1950 is loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer202206250961018879eb9c23119c4d2ed7html5thumbnails34jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=35Page 35button div class=ts-imageimg data-url=aehs-lockheed-super-constellation-and-douglas-dc-7-aircraft-thusthe-engine-thathtmlpage=35 data-page=35 class=ts-thumb lazyload alt=Page 35: AEHS Home · Lockheed Super-constellation and Douglas DC-7 aircraft Thusthe engine that developed from an idea in 1942 to a proposal in 1946 and a production engine in 1950 is loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer202206250961018879eb9c23119c4d2ed7html5thumbnails35jpg width=140 height=200 divdivdiv 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