Abstract: An apparatus for transmitting measured value signals from a movable object to an object fixed relative thereto, includes a transmitter and receiver, each containing a common oscillatory circuit, carried on the fixed object, and a coupling circuit, also containing an oscillatory circuit, carried by the movable object, the oscillatory circuits for the transmitter and receiver being alternately switched between operative and inoperative conditions, whereby an oscillatory frequency signal is first transmitted by the transmitter to energize the oscillatory circuit of the coupling circuit, and then the transmitter is switched off and the receiver is switched on to receive the oscillatory frequency signals from the coupling circuit.