The company that  employs approximately 100,000 people and had a merger with a Fortune 500 company headquartered in the Greenspoint district and in unincorporated Harris County, Texas, is the worlds largest what?
Smith International: Smith International was a Fortune 500 company headquartered in the Greenspoint district and in unincorporated Harris County, Texas. Schlumberger:  Schlumberger employs approximately 100,000 people
i don't know