| http://www.w3.org/ns/prov#value | - s, and systems for exchanging information between excavators and other entities associated with underground facility locate and marking operationsUS856673713 Apr 200922 Oct 2013Certusview Technologies, LlcVirtual white lines (VWL) application for indicating an area of planned excavationUS86122711 Oct 200917 Dec 2013Certusview Technologies, LlcMethods and apparatus for analyzing locate and marking
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