marcador eletrônico para a marcação de artigos obscurecidos, suporte alongado, método para produção de um marcador eletrônico para marcação de artigos obscurecidos, conduto a ser disposto no subsolo

摘要

An electronic marker and method of making an electronic marker for marking obscured articles. The marker includes a core made of flexible, and sometimes high permeability magnetic material and a solenoid disposed around the core. A capacitor is electrically coupled with the solenoid, and the marker is tuned to respond to a signal at a characteristic resonant frequency. The marker can attached to a conduit to be buried underground. The marker can further include a radio frequency identification chip.