Radio-frquency interference guard in form of low-pass filter

Claim 1

AN ATTENUATOR FOR PROVIDING PROTECTION AGAINST SPURIOUT RADIO FREQUENCY INDUCED BY EXTERNAL ELECTROMAGNETIC AND ELECTROSTATIC FIELDS COMPRISING AN INSULATED WIRE FOR CONDUCTING AND PASSING ANY D.C. OR LOW FREQUENCY ENERGY DIRECTLY THROUGH SAID ATTENUATOR, A SHIELDING ENCLOSURE FOR CONDUCTING ANY RADIO FREQUENCY ENERGY ON SAID WIRE AWAY FROM SAID WIRE COMPRISING ELONGATED IRON TUBE MEANS ENCLOSING SAID WIRE HAVING TWO DIRECT CONDUCTIVE CONNECTIONS AT THE EXTREMITIES OF SAID IRON TUBE MEANS TO SAID WIRE WHEREBY THE SKIN DEPTH THICKNESS OF SAID IRON TUBE MEANS DETERMINES THE AMOUNT OF CONDUCTION OF RADIO FREQUENCY ENERGY AWAY FROM SAID WIRE, AND THE LENGTH OF SAID IRON TUBE MEANS DETERMINES THE D.C. SHUNT RESISTANCE FOR ANY D.C. OR LOW FREQUENCY ENERGY ON SAID WIRE AND PREVENTS SAID D.C. OR LOW FREQUENCY ENERGY FROM BEING CARRIED BY SAID IRON TUBES MEANS, A CONDUCTIVE AND NON-