Flat electric cables

Claim 1

AN ELECTRIC FLAT CABLE COMPRISING AT LEAST ONE LAYER OF A PLURALITY OF PARALLEL LONGITUDINAL THIN FLAT FLEXIBLE CONDUCTIVE STRANDS IN EDGE TO EDGE DISPOSITION, RESPECTIVE SIMILAR SHEATHS OF PREFABRICATED THIN FLEXIBLE INSULATING MATERIAL COMPLETELY ENVELOPING THE STRANDS AND JOINED TOGETHER AND HAVING A TOTAL WIDTH OF INSULATING MATERIAL AT LEAST TWICE THE TOTAL WIDTH OF THE CONDUCTIVE STRANDS, AT LEAST A MAJOR PART OF THE SURFACE OF THE CONDUCTOR STRANDS BEING FREE TO MOVE LONGITUDINALLY RELATIVELY TO THE SHEATHS, THERE BEING NO ZONES OF ADHESION BETWEEN THE STRANDS AND THE SHEATHS LONG ENOUGH TO IMPAIR SUBSTANTIALLY THE LONGITUDINAL MOBILITY OF THE STRANDS IN RELATION TO THE SHEATHS OVER THE MAJOR PART OF THE LENGTHS OF THE STRANDS AND THERE BEING NO ZONES OF ADHESION BETWEEN THE STRANDS AND SHEATHS AT DISTANCES SHORT ENOUGH TO RESULT IN CONTACT BETWEEN THE STRANDS IF THE STRANDS WITHOUT THE SHEATHS WERE FLEXED IN THEIR OWN PLANE TO THE LIMIT OF THEIR ENDURANCE, AND THE MOBILITY OF THE CONDUCTIVE STRANDS INSIDE THEIR INSULATING SHEATHS BEING ENHANCED BY THE PRESENCE OF A LUBRICATING AGENT EXTENDING AT LEAST OVER A PART OF ONE OF THEIR CONTACTING SURFACES.