BSR question

The "Notable US Manufacturers page lists BSR's Red Mountain being produced from 1900-1940, but the "NoName" page lists it as being made during the 30s and 40s. Which is correct?
 
It's a loose end waiting for a better answer. Most when asked would say RM was made 1930s-40s, but BSR was in business making hollowware long before that. Although there are dated materials calling the ware RM as early as the 1930s, there doesn't seem to be anything to confirm that decade was precisely when it was introduced as a brand name.
 
Hmmm. So is it generally accepted that RM was BSR's first line, and it started in the 30's, or as early as 1900, or that there was another line before the RM, which maybe was produced from 1900-1930, when RM started? Just curious I guess.
 
There seems to be nothing to confirm what it was called, if anything, before the 30s.
 
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