Awarded in 1930 to Herbert George Beyer, this covers a design very similar to the Rolmonica:
As Beyer's home is given as Baltimore, it is tempting to speculate that there might be some connection between him and the Rolmonica Co., but I don't know if that is the case or not. Beyer was also awarded Swiss Patent 138624, German Patent 502116 and British Patent 322678 for this design.
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