Inorganic spark chamber frame and method of making the same
Integral grid/cathode for vacuum tubes
Ion gating grid
Mesh electrodes
Mesh structure for a photomultiplier tube
One piece astigmatic grid for color picture tube electron gun
Parallel-wire grid assembly with method and apparatus for constr
Self-aligned double grids for vacuum tubes
Thermionic cathode having an embedded grid, process for its fabr
Thermionic electron source with bonded control grid