Electrical heating devices

Claim 1

AN ELECTRICAL RADIAANT HEATING PANEL COMPRISING A RECTANGULAR ELECTRICAL INSULATING AND THERMAL CONDUCTING SHEET OF PLASTERBOARD, SAID SHEET HAVING A CONTINUOUS RECESS IN A FACE THEREOF WITH PARALLEL STRAIGHT SPACED APART PORTION EXTENDS LENGTHWISE OF SAID SHEET PARALLEL TO, BUT SPACED FROM, THE SIDE EDGES THEREOF WITH SAID LENGTHWISE PORTIONS JOINED AT THEIR OPPOSITE ENDS BY END PORTIONS OF SAID RECESS EXTENDING PARALLEL TO, BUT SPACED FROM, THE END EDGES OF SAID PLASTERBOARD SHEET, AN ELECTRICAL HEATING WIRE EXTENDING LENGTHWISE OF SAID SHEET RECESS WITH THE OPPOSITE ENDS OF SAID WIRE TERMINATING ADJACENT ONE ANOTHER IN SAID RECESS, NON-HEATING ELECTRICAL CONDUCTING WIRES EXTENDING FROM SAID SHEET RECESS, MEANS CONNECTING EACH END OF SAID HEATING WIRE TO AN END OF SAID NONHEATING WIRE IN SAID RECESS, AN ELECTRICAL INSULATING MATERIAL FILLING SAID RECESS ONLY ABOVE SAID WIRES LEVEL TO SAID SHEET FACE RETAINING SAID WIRES IN SAID RECESS, AND A PAPER SHEET COVERING SAID PLASTERBOARD SHEET FACE AND SAID FILLING AND HAVING AN OPENING WITH SAID NON-HEATING WIRE EXTENDING THERETHROUGH.