Low frequency electromagnetic therapy apparatus; Electronic aesthetic skin treatment devices using light emitting diodes, namely, infrared, red, orange, yellow, green, and blue wavelengths for generating light rays; Electronic light therapy apparatus for the skin; UV lamps for medical applications; Apparatus for magnet therapy; Hearing aids; Hematimeters; Medical ventilators; Air filters for medical ventilators; Apparatus using a light emitting diode (LED) for performing aesthetic facial trea...