Whether Blumfeld engaged in a spot of light fingered logo development or not, it won't surprise you to hear that Frankau was extremely strict in suing anyone coming within a country mile of the BBB brand. My personal favorite was in 1887 when they sued the crap out of a small competitor named Hopkins & Co for selling product with a logo consisting of a diamond with 3 R's in it.
Another favorite lawsuit from a year earlier happened when Marechal and Bine sued a NY competitor for using a logo consisting of the letters G.P.D. in an oval. I admire their chutzpah; the judge, however, did not.