Methods, apparatus, and systems for providing information regarding a locate and/or marking operation to identify a presence or an absence of at least one underground facility within a dig area. At least one notification indicating a status of the locate and/or marking operation is electronically transmitted...http://www.google.com.hk/patents/US20100259381?utm_source=gb-gplus-share專利 US20100259381 - METHODS, APPARATUS AND SYSTEMS FOR NOTIFYING EXCAVATORS AND OTHER ENTITIES OF THE STATUS OF IN-PROGRESS UNDERGROUND FACILITY LOCATE AND MARKING OPERATIONS
