Electro-magnetic therapeutic system is the English title of Canadian Patent 1,113,156 which was issued in 1981. The inventors Dr. Roland A. Drolet and Gaetan Charland, both from Canada, claimed that the device was an "electro-magnetic device for treating various types of rheumatic and arthritic diseases." [2] The invention related to a technique of bombarding human bodies with low-frequency electromagnetic waves and controlled the wave frequency using "circuit means".