Patent ID: 8289167

Claim:
A surveyor's mark, comprising: a stick configured to be planted in a ground; and a head removably assembled to the stick and configured to be above the ground when the stick is planted in the ground such that the head removably assembled to the stick facilitates separation of the head from the stick upon an attempted removal of the surveyor's mark, wherein the head comprises a tag; wherein the tag in the head comprises an identification number that identifies the tag and indicates if the head is disassembled from the stick, wherein the identification number has a value consisting of a first code value, wherein the stick comprises a thin wire configured as an electrical conducting loop and connected to the tag, and wherein if the stick is planted in the ground and the head is above the ground, then pulling the head in an attempt to pull up the mark from the ground results in the head being disassembled from the stick and the thin wire breaking so as to open the loop which changes the value of the identification number in the tag in the head from the first code value to a second code value that differs from the first code value.