Popular Mechanics 1940-10.jpg ThumbnailsScientific American 1920-08-07ThumbnailsScientific American 1920-08-07ThumbnailsScientific American 1920-08-07ThumbnailsScientific American 1920-08-07ThumbnailsScientific American 1920-08-07
Giant bulldozer shown knocking down a tall tree. "Age of Opportunity," by Charles F. Kettering.



Artist:

Source: Horton Family, Noblesville, Indiana

Restoration by: magscanner