Erector Set
In 1913, A. C. Gilbert introduced the Erector Set with the first national advertising campaign for a toy. The Erector Set contained girders and bolts that could be assembled into miniature buildings or other structures, and was acclaimed as fostering creativity in constructive play. In 1924, it was redesigned to include miniature electric motors and other pieces which could be used to create all sorts of self-actuated machines.