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12a

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Lockheed 12A sectional view of heated wing ARC-1941-AAL-1355A

Lockheed 12A sectional view of heated wing ARC-1941-AAL-1355A

Lockheed 12A sectional view of heated wing

Lockheed 12A ground tests of cellular type heated wing ARC-1951-AAL-1382

Lockheed 12A ground tests of cellular type heated wing ARC-1951-AAL-13...

Lockheed 12A ground tests of cellular type heated wing