[78-L] Bell Novelty / Radio Record labels

[Glenn Longwell]

This is probably aimed at Mike Biel...
 
Both of these "novelty" record labels were run by Benny Bell.  Did they co-exist or was one set up after the other?  It would appear Bell is later but am uncertain.  Mike - you mention Bell's copyright dates refer to material, not the label.  Is this also true on Radio Record company labels as well?  I have one that gives a copyright date of 1940.  Curious about date ranges of the label.
 
Thanks,
Glenn