The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com High Resolution Violet Rays Violet Rays Everywhere Osborne Garrett Nagele Ltd Violet Ray Master Violet Ray Marvel Violet Rays - Eastern Laboratories - Early and late models The typical housing seen here was either red or black I have only seen 2 of these machines, late models.  Same internal parts, different housing. Frank S Betz Violet Ray Fitzgerald Violet Ray Elco Violet Ray Cesco Violet Ray Renulife Viraozone Bleadon Dun Violetta Assortment Baby Violetta Type C Bleadon Dun one-piece machine Violet Ray Corp = Viracorp - successors to Master Electric Tuckers Violet Ray - Variation of Rogers patent Shelton Violet Rays Halliwell Shelton - unusual! Beautifully made Shelton Laboratories Later Haliwell Shelton brand Vi-Ray-O Renulife knob... Renulife machines Re'juvin Electrodes Nameplate Parco Super High Frequency Machine - Variation of Rogers patent Branston Violet Rays - Made in Canada