Electrical novelties : the ultra vacuum electrodes, X-ray tubes and stands, the multiple spark interrupter, spark lamp to produce violet rays, spark regulator for coil, electric heaters, X-ray plates (1903)
Swett & Lewis Company, Boston · Boston : Swett & Lewis Company · leaf 9
N9I7-I8 … ^ ^93 [N5] SWETT & LEWIS COMPANY
Electric apparatus and appliances · X-rays · Electrical Equipment and Supplies
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