Device for regulating the size of the focal spot in incandescent cathode roentgen tubes
GB221468A
Improvements in the manufacture of bricks, building blocks, slabs, tiles and the like for resisting x-rays, radium emanations and the like, and in walls, partitions and t he like made thereof
DE352284C
Water-cooled vacuum tubes, especially X-ray tubes
DE347954C
Roentgen tube with a device for picking out the phase parts used for your operation from an alternating current
DE341241C
Hollow cathode for vacuum tubes suitable for the passage of electrons
