| http://www.w3.org/ns/prov#value | - Or do not they care?Reuters reports: The following are major service companies that operate in Venezuela:* Schlumberger : The world's largest oil service company is also the principal provider of services in Venezuela including drilling, measurement and well services designed to boost output of operations.Sources say PDVSA's debts with Schlumberger are the largest among the service companies operat
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