Abstract: An automatically reversing, self-cleaning electric switch preferably for use in miniature, electronic aggregates such as hearing aids comprises a box (1) manufactured from electrically insulating material with a pushing rod (2) also from electrically insulating material mounted in the upper end of the box, a U-formed spring (4) fastened in a hollow space within the pushing rod and spring legs (5,6) which depending on the position of the pushing rod may rest against one or more end terminals (7,8,9) mounted in the lower part of the box for disconnecting or connecting a current through the switch. The resilient force of the U-formed spring causes the pushing rod to revert automatically to a center or zero position when no outer force is applied to the rod and a self-cleaning effect is obtained through the spring legs (5,6) resting slidingly against the terminals (7,8,9).

Abstract: A headphone with microphone which is particularly suitable for use in connection with telephone apparatus includes a carrying ear hanger having a disc member which is adapted to the back of the ear and a hook member that extends forward on the topside of the ear when in a working position. A microphone and earphone are placed in a microtelephone arm which is connected to the ear hanger via a hinge, and a spring connected with the hinge holds the earphone against a user's ear and thus the microphone close to the user's mouth.