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April 1, 1999, when the company made a contract with subsidiaries in operation and maintenance of gas pipelines. The company will perform system maintenance and gas company by its subsidiaries have commitments to pay service charges monthly according to a formula. The conditions and criteria stated in the contract. This contract is set for 5 years and can be renewed each year automatically again. This contract is valid until the parties are a party a written notice of cancellation a contract official for a period of 12 months in advance.
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