It took Mort Weisinger 20 years in each instance to recycle the images for the 1960-61 "Jimmy Olsen's Private Monster" and "The Giant Turtle Man" from pulp covers of 1940-41.
The editors of Amazing Mystery Funnies managed a much quicker turnaround. In Volume 2 #11 (November 1939) The Fantom of the Fair fights a robot standing in for, I should think, the real Fair's Elektro (who did turn up in All-Star Squadron in the 80s). Here the robot is taken from Amazing Stories earlier in the same year—January 1939. The pulp robot is of course Otto Binder’s Adam Link, who would appear in comics himself in the 50s and 60s.
