By 1919, the Bleadon-Dun Co., of Chicago, was manufacturing various violet ray machines, all termed Violetta, and all delivering a high frequency ray that “Relieves Pain and Promotes Health.” The EMF Electrical Year Book for 1923 described Bleadon-Dun as “the world’s largest exclusive manufacturers of portable, one-piece, high frequency generators and equipment.” An inscription on this violet ray machine reads “Violetta . . . BLEADON-DUN . . .” A paper label in the lid carries a guarantee from the firm.
Ref: Bleadon-Dun Co., Violet Rays as Applied with the Violetta (Chicago, 1919 and 1923).
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