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Back between 1938-1942 Fox comic book titles were published as Fantastic Comics, Green Mask, among others.
During the summer of 1941 all the Fox comic book titles were full of ads for a drink called Kooba Cola, which was apparently never made. It seems it was all a Victor Fox (Fox publisher) scheme to create a demand before the product even existed.
Stay tuned, I'm gonna get mor info on this one.
Peace and try and have a great week,
HMK