Airgas ( ARG), the largest U.S. distributor of industrial, medical and specialty gases, agreed to acquire the assets and operations of Airtec. Terms weren't disclosed. Airtec, an Altoona, Wis., industrial gas and welding supply distributor with six locations in Wisconsin and one in Minneapolis, had sales of about $13 million in 2005 and employs about 60 people. The company will be integrated into Airgas North Central, one of Airgas' 13 regional companies. The acquisition is expected to close by April 1. "The Airtec operations will add to our service capabilities, strengthen our presence in Eau Claire, Wausau and Fond du Lac, and add new branch locations in Hudson, Sheboygan, North Milwaukee, and Minneapolis," the company said.