Royal Raymond Rife (May 16, 1888 – August 5, 1971) was an American inventor known for his belief that he could observe and render inert a number of viruses which he thought were causal factors in several diseases, most notably cancer. The observations were made though a specially designed optical microscope, only five of which were ever constructed. Rife claimed that a "beam ray" device could devitalize the pathogens by inducing destructive resonances in their constituent chemicals.[1] Rife's claims could not be independently replicated, and active scientific interest in the devices had dissipated by the 1950s.
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The following is referring to Electric Frequency devices that are also sometimes called Rife-Crane devices, Hulda Clark Zapper, Micro current devise. Interferencial, Galvanic, TENS devices,NMS Neuro Muscular or transcutanous nerve stimulator (more definitions :
en.wikipedia.org/wiki/Transcutaneous_Electrical_Nerve_Stimulator) They all have in common that electric energy is applied to a client via electrodes, they are often confused with actual Rife devices which actually apply frequencies as light via Plasma tubes, electric application was introduces by a follower of Rife with the name of Crane and therefore those devices are also often called Rife-Crane but should be called more appropriately Electric Frequency devices. To view actual Rife devices please see here :
www.energy-medicine.info/true-rife-plasma-devices.html
One of the first to use the concept of vibrational healing was Royal Rife, who observed under his microscope that if he used specific colors to illuminate his specimen, this would selectively kill bacteria or even viruses. His work was continued by Crane who found that the same was true if one applied different electrical frequencies to the skin via electrodes (so-called pad devices). Hulda Clark made this discovery public, claiming it to be her own. She promotes the Zapper, a pad device with only a single frequency that should be effective against microbes.