MARKER FOR DETECTING BURIED OBJECT

摘要

A marker (2) for positioning near a buried object wherein the marker can be detected to locate the buried object (1). The marker includes a passive resonant type antenna (6) which becomes inoperative when the initial position for the buried marker is changed. A lead wire (5d) and/or a mercury switch (13) that is a part of the antenna serve to make the antenna inoperative due to such change in the initial position of the marker (2).