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Jim Henson Robot for Bell System (Now AT&T)

AT&T/Bell Systems Jim Henson Robot

This was made by Jim Henson for Bell System in 1963. The video notes:

It also may be the same robot that appeared on the Mike Douglas Show in 1966. Henson created a different — but similar — robot for the SKF Industries pavilion at the 1964 World’s Fair.

So essentially Elmo’s great grandfather is this Steampunk robot.