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December 17, 1938


JAMA. 1938;111(25):2303. doi:10.1001/jama.1938.72790510014013a

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Manufacturer: McIntosh Electrical Corporation, 233 North California Avenue, Chicago.

The Hogan Advance Model Brevatherm, Model #8640, is a portable short wave diathermy unit. It may be used for medical diathermy and for minor surgery. It is available with a mobile walnut or ivory finished cabinet, Model #8645. Standard accessories include one set of pad and one of cuff electrodes. Optional accessories consist of inductance cable and electrosurgical instruments.

The vacuum tubes in a tuned plate, tuned grid, push-pull oscillator circuit generate high frequency energy at a wavelength of approximately 12 meters. The output circuit for the cuff and pad electrodes is inductively coupled and the circuit for the cable is capacitatively coupled to the plate circuits of the oscillator.

The firm claims that the unit has an output of 240 watts as measured by a lamp load, photoelectric cell and wattmeter at a voltage of 116.5. The Council's investigator confirmed

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