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Yeah! thats him! Billy Mumy? is that his name.
I keep getting confused with Butch Patrick (Eddie Munster)! lol
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Those under chin air holes are quite visible in the film.
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There is an excellent article online (somewhere) about the 7' 7" Lock Martin's experiences in the Gort suit.
I wish I could find it again.
He apparently experienced all kinds of problems with movement, over-heating, and restricted blood circulation.
In fact, in one scene in the film you can see the robot shaking his arm...
apparently Martin had lost feeling in his hands during filming.