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In copyright.
Note
Folder: S.F. Districts-Hunters Point-Shipyards-1940's. Newscopy: "BREAKING AN EGG WITH 630-TON WEIGHT--An egg (left) is placed under edge of concrete, steel and led (sic) slab weighing approximately 630 tons, as part of a test of the delicate machinery controlling the world's newest and most powerful crane at Hunter's Point naval Shipyards here today. At right the crane has lowered the 630-ton slab enough to break eggshell but NOT the yolk.". "A. P. Wirephoto."