Wonder Boy was pubbed by both Quality and Ajax and whoever did BOMBER COMICS. The Flame and Samson went thru both Quality and Ajax. Green Hornet, a licensed character, was pubbed by Helnit, Harvey, Dell, Gold Key, Now, and Dynamite (at least). Plus we have the Fox / Holyoke / Fox thing, and Charlton taking over Fawcett characters like Nyoka, Ibis, and Hoppy, the Blue Beetle from Fox, Bullseye from Mainline, etc. You can even put in there Blackhawk and Plastic Man going from Quality to DC (I'm leaving out the Seventies revivals).