1938 – Mechanical Elephant – George and Gordon Hutton (American)
Source: Popular Mechanics Feb 1938.
G.G. Hutton sells his partnership to George Washington Shrum. Most images of "Jumbo" post the 1939-40 N.Y. World's Fair are shown as "Rosie" and owned by Shrum.
Most of the photos below are sourced from Life magazine. Life have over 70 images, I've just selected a few.
Lucky for the little boy that this is only a 'mechanical' elephant, stationary whist it undergoes a tyre change.
Source: Miami News Aug 29, 1938.
Source: The Billboard Jan 31, 1942.
Source: The Billboard Jun 21, 1952.
Source: The Billboard Feb 7, 1953.
Source: The Billboard Aug 27, 1953.
It is quite possible this elephant was built earlier than 1938, but I haven't found any earlier sources as yet.