Oh, yes. Comics packagers was a business back then for companies that wanted to put out comics but didn't have artists, writers, editors, etc.
The Eisner-Iger shop was one. Funnies, Inc. was another. IIRC Harry A. Chesler had a shop.
Companies that used packagers (at least at the beginning) would be Marvel/Timely, MLJ, heck Dell's relationship with Western Publishing could be the longest lasting comics packaging relationships.
Find some books about the history of comics and you can find more information.