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Rockwell Automation Inc. (NYSE: ROK) is expanding  its oil and gas services business.

It recently acquired Dubai-based vMonitor, a wireless monitor-and-control system for oil and gas wells.

Milwaukee-based Rockwell specializes in process controls solutions It will expand in Houston by adding about 120 employees. vMonitor has a technology center in Houston.

More acquisitions could be coming.

“The oil and gas industry is one of the industries we are looking at acquisitions in,” John Bernaden of Rockwell told the Houston Business Journal. “We are interested in automation and information technologies.”

Rockwell has 22,000 worldwide. It’s process business — the fastest growing in the company — includes oil, gas and chemical products.

Rockwell had 2012 revenue of $6.3 billion. The process business accounted for about $900 million. The company hopes to double that in five years.