Radio warning system

Claim 1

A RADIO RECEIVER USABLE FOR BOTH CONVENTIONAL BROADCAST RECEPTION AND FOR RECEPTION OF WARNING SIGNALS COM-/ PRISING, CIRCUIT MEANS TUNABLE TO BOTH BROADCAST AND WARNING SIGNALS, DETACHING MEANS FOR DERIVING AUDIO FREQUENCY SIGNALS FROM THE RECEIVED SIGNALS, A VOLUME CONTROL COUPLED TO SAID DETECTING MEANS OR CONTROLLING THE AMPLITUDE OF SAID AUDIO SIGNALS, AMPLIFIER MEANS FOR SAID AUDIO SIGNALS, MEANS FOR CONTROLLING THE OPERABILITY OF SAID AMPLIFIER MEANS, SELECTIVE CIRCUIT MEANS COUPLED TO RECEIVE AUDIO FREQUENCY SIGNALS DERIVED BY SAID DETECTING MEANS AND RESPONSIVE TO SIGNALS OF A PREDETERMINED FREQUENCY TO DEVELOP AN OUTPUT POTENTIAL, AND TWO-POSITION CONTROL SWITCH MEANS OPERABLE IN ONE POSITION TO CONNECT THE RECEIVER TUNABLE CIRCUIT MEANS FOR CONVENTIONAL BROADCAST RECEPTION, COUPLE THE DETECTOR OUTPUT THROUGH SAID VOLUME CONTROL TO SAID AMPLIFIER MEANS, AND RENDER SAID AMPLIFIER MEANS OPERATIVE, AND OPERABLE IN THE OTHER POSITION TO TUNE SAID RECEIVER FOR WARNING SIGNAL RECEPTION, COUPLE THE DETECTOR OUTPUT DIRECTLY TO SAID AMPLIFIER MEANS, AND COUPLE SAID SELECTIVE CIRCUIT MEANS TO SAID CONTROLLING MEANS FOR SAID AMPLIFIER MEANS TO RENDER THE LATTER OPERABLE IN RESPONSE TO SAID OUTPUT POTENTIAL, SAID CONTROL SWITCH MEANS CORRESPONDING TO A CONVENTIOANL ON-OFF SWITCH WHEREBY SWITCHING OF SAID RECEIVER TO DISCONTINUE CONVENTIONAL BROADCAST RECEPTION NECESSARILY CONNECTS THE RECEIVER FOR WARNING SIGNAL RECEPTION.