Ok, near as I can figure here is the organizational layout of the "Universal Comics Group":
Es-Et-Go Magazines was the art shop where L.B. Cole was employed.
Holyoke Printing, Holyoke, Mass. was the print shop
Publishers Distributing Company [PDC symbol on the covers] did the distribution.
All three companies were owned by Frank Z. Temerson and Irving W. Ullman. Aside from their own publications (those commonly refered to as Holyoke or Continental) they would also crank out a lot of dreck for anyone with the cash (and Cole would often toss a cool cover on an otherwise smelly pile of cr*p).
Here is the list of "member companies" for this group (as near as I can puzzle out):
Universal Comics Group
-----------------------------
B. Antin Magazines
D.S. Publishing Co.
E.R. Ross Publishing
L.L. Baird
Almanac Publishing Co.
Bailey Enterprises
Bernard Bailey Enterprises
Bailey Publ. Co.
Carlton
Cima Publications
Circus Comics
Continental Magazines
Continental Publ.
Croyden Publishers
Croyden Publications
Enwil Associates
Et-Es-Go Magazines, Inc.
Farm Women's Publishing (Gail Hillson)
Gerona Publications
Helnit Publ. Co.
Holyoke Publishing Co.
Jay Burtis Publ.
Jay-Jay Corp.
Narrative Magazines
Narrative Publ.
Orbit Publications (owned by Rae Herman, Frank Temerson's secretary)
Our Publishing Co.
Patches Publ.
Public Recreations
Rewl Publications
Rural Home
Special Action
Swapper Quarterly
Swappers Quarterly
Tem Publishing Co.
Toytown Publications
Temerson and Ullman were a shifty pair and it appears they helped Victor Fox protect his cash cow title, Blue Beetle, when Fox was hounded by creditors in 1942. It looks like Fox moved Blue Beetle over to Holyoke (while still maintaining ownership) and then declared bankruptcy. He probably continued to generate an income from this title and used it to help fund his company's rebirth in 1944 (at which point the Blue Beetle transfered back to Fox directly).