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Scientific American 1920-09-18

ScientificAmerican1920-09-18.jpg Scientific American 1920-08-14ThumbnailsScientific American 1926-07Scientific American 1920-08-14ThumbnailsScientific American 1926-07Scientific American 1920-08-14ThumbnailsScientific American 1926-07Scientific American 1920-08-14ThumbnailsScientific American 1926-07

Inspecting 140 separate points of an automobile engine cam shaft