Praxair

Praxair describes itself as a "global, Fortune 300 company that supplies atmospheric, process and specialty gases, high-performance coatings, and related services and technologies to a wide diversity of customers." In 2008 it had sales of $10.8 billion.

On its website the firm states that one of its primary products are "process & specialty gases -- carbon dioxide, helium, hydrogen, semiconductor process gases, and acetylene (produced as by-products of chemical production or recovered from natural gas)."

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