Cave Girl had four issues of jungle adventures (numbers 11 to 14), and the last one had a
strange machine that made dead people come to life by sending them into their own past, but
keeping them in the present moment. In the end, the machine sends itself into the far past
and disappears from the present.
The comic was published by Magazine Enterprises, which
published from 1944 to 1958. So far, this Cave Girl is the only time travel I’ve
spotted, though I do have one of their Teena issues in my dad’s stash of comics.