A system (100) for mapping an underground object (145) includes a conduit location recording device 105 and a server (115). The conduit location recording device (105) senses an underground object (145), a unique identifier being associated with the sensed underground object (145), and determines a location...http://www.google.ca/patents/US6850161?utm_source=gb-gplus-sharePatent US6850161 - Systems and methods for identifying and mapping conduit location
