Abstract: A dampened choke coil structure having a ferromagnetic core and a winding of wire disposed about the core to form a choke coil. A second winding of substantially higher resistance material is wound generally parallel to the choke winding either inside or outside thereof. The number of turns of the two windings differ by more than 25%. In this way, parasitic capacitances are caused to have a decreased effect on the choke coils.

Abstract: Joints in electromagnetic wave shields, such as between access doors and the door frames of the shield housings or jackets are electrically bridged by means of contact springs which are generally V-cross-section having base portions clamped at one side of the joint and provide contact edges which engage in efficient electrical contact with the opposite side of the joint. Advantageous construction, insulation and attachment of the clamps for the springs are provided for. Improved functioning of the sealing spring system is attained by use of soft magnetic material in the clamps, in association with the clamps, or in connection with the joint profile structure.