Master Violet Ray

From Kook Science

Master Violet Ray
Medical Claims "[...] without an equal in relieving pain and congestion, stimulating the circulation and restoring good health, vigor and youth."
Vendors Master Electric Co.;
Master Appliances Co.

The Master Violet Ray is a violet ray-type device that was marketed as an instrument for electro-therapy. It was sold by Master Electric Co. (and later Master Appliances).