1917 – Walking Tractor – (Unknown) (American)

Popular Mechanics October 1917 p520-1 In plowing and cultivating, a well-trained, intelligent train of horses means much to a farmer. Therefore it is not surprising that many agriculturists are slow in accepting the tractor, with its clumsy wheels and grinding motor, for such work. For these reluctant ruralists, however, a new kind of machine has …

1917 – Coleman’s Walking Dummy – Harry Coleman (British/American)

Patent number: 1221970 . See full patent details here. Filing date: Feb 20, 1917 Issue date: Apr 10, 1917 Fort Wayne News 01 May 1917 p6 THE WALKING DOLLS. Harry Coleman of New Palace to Make Them a Fad. Harry Coleman's convict clad walking doll is going to have a lot of sisters and brothers …

1915 – Electric Dog – Christian Berger – (Hungarian / American)

I found a single reference to a French Electric Dog that "will jump out of its kennel when a whistle sounds". The rest of the brief article talks about Miessner's "Electric Dog". Ingenious Mechanism – Le Grand Reporter, 30 Dec 1921 p2  The electric dog which will follow a lantern in the dark—a mechanical curio constructed by …