"TWIN-TUBE DRILL ROD SECTION, TWIN-TUBE DRILL ROD LENGTH AND METHOD FOR FORMING AN ELECTRICALLY CONDUCTIVE CONNECTION IN A TWIN-TUBE DRILL ROD SECTION"
Twin-tube drill rod section (6) with an outer drill rod section (1) and an inner drill rod section (2), wherein the inner drill rod section has at least one conductor (8), wherein the inner drill rod section has a substantially annular outer contact (10) for forming an electrical connection of the conductor and, in the annular space (4) between the outer drill rod section and the inner drill rod section, a collector (13) is in contact with the annular outer contact of the inner drill rod section.