Grant Prideco Inc., Houston, (NYSE: GRP) has acquired Aberdeen, Scotland-based Anderson Group Ltd. (Andergauge Ltd.) and related companies for US$115.7 million plus US$39.9 million in assumed debt. Andergauge is a provider of specialized downhole drilling tools and provides services related to these tools. Estimated full-year revenue for 2006 is approximately US$70 million and estimated full-year EBITDA is approximately US$26 million.