aoc harlingen
AOC sold to Praxair, Inc. By TRAVIS M. WHITEHEAD Valley Morning Star Valley Morning Star HARLINGEN â Acetylene Oxygen Company, a Harlingen-based company with 30 locations throughout Texas, has finalized its sale to Praxair, Inc. based in Danbury, Conn. According to a company spokesman, Praxair is the largest industrial gases company in North and South America, and one of the largest worldwide, with 2011 sales of $11 billion.