[78-L] Swing Time, Down Beat questions

[Philip Fukuda]

I've run across Swing Time, Down Beat, Swing and now Swing Beat (combining the 2 names!) labels from the 1940s. All with the same label design, so I'm guessing the same ownership. I can't figure out if certain artists only appeared on 1 label or several. Was the numbering system shared between the labels? Is there any rhyme or reason to all those labels?

Thanks,
Philip Fukuda