Sinclair 100 octane for new sky giants

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Sinclair 100 octane for new sky giants. Shown in this March 3, 1945 Ad is the Douglas Super Airliner. Also interior view of this five mile a minuet, four engine fifty passenger plane. Sinclair Refining co maker of Sinclair Pennsylvania Motor Oil. Magazine tear sheet picture is taken through plastic and may show wrinkles or crookedness that is not in the ad. This original magazine tear sheet measures 10 1/2 inches wide by 13 1/2 inches tall