Electrical Novelties: The Ultra Vacuum Electrodes, X-Ray Tubes and Stands, the Multiple Spark Interrupter, Spark Lamp to Produce Violet Rays, Spark ... Heaters, X-Ray Plates (Classic Reprint)

الوصف

Electrical Novelties: The Ultra Vacuum Electrodes, X-Ray Tubes and Stands, the Multiple Spark Interrupter, Spark Lamp to Produce Violet Rays, Spark ... Heaters, X-Ray Plates (Classic Reprint)