1954 – Thodar the Robot – Ron Hezel (American)

See story as told on TV – "Robot inventor speaks out about his journey" Video By: Mark Repasky : 02/11/2008 – 09:36 PM The Story of Thodar© as seen on YouTube May 2009 ( Video story about Thodar© starts 2.28 minutes into the report.) see Ron Hezel's website here. Thodar in good company. Updated 02/11/2008 …

1968 – Phony Pony – Frank, McGhee (American)

Leg detail – motors are modified power drills. From George A. Bekey – Autonomous Robots – From Biological Inspiration to Implementation and Control (2005) The first autonomous quadruped robot in the United States was constructed in the 1960's at the University of Southern California; it was dubbed the Phony Pony [ McGhee's own documents also …

1968 – Iron Mule Train – R. A. Morrison (American)

Although referred to as the "Iron Mule Train", only one carriage was built for test purposes. I believe it was Frank Tinsley's original idea in extending Space General's original Moonwalker that inspired Morrison into promoting this third variant (the other being the Moonwalker disability walker after NASA's cancellation of the earlier unmanned moon rover programme.)  …

1961 – Iron Mule Train (Concept) – Frank Tinsley (American)

Although published in 1962, the illustration is dated 1961. Frank Tinsley's concept pre-dates A. J. Morrison's "Iron Mule Train" by about 7 years. Given the cancelled Space programme for an un-manned lunar misssion, I wouldn't be surprised that Tinsley's concept inspired Morrison in resurrecting the Moonwalker project (having already had a second life as a Disability walker) …