Midwestern Gas Transmission Company

Third Revised Volume No. 1

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Effective Date: 12/01/2009, Docket: RP10-74-000, Status: Effective

Sixth Revised Sheet No. 0 MIDWESTERN GAS TRANSMISSION COMPANY: Third Revised Volume No. 1

Sixth Revised Sheet No. 0

Superseding: Fifth Revised Sheet No. 0

FERC GAS TARIFF

THIRD REVISED VOLUME NO. 1

OF

MIDWESTERN GAS TRANSMISSION COMPANY

FILED WITH THE

FEDERAL ENERGY REGULATORY COMMISSION

COMMUNICATIONS CONCERNING TARIFF

SHOULD BE ADDRESSED TO:

Ron Mucci

Vice President, Rates & Regulatory Affairs

ONEOK Partners GP, L.L.C., its Operator

MIDWESTERN GAS TRANSMISSION COMPANY

P. O. Box 871

Tulsa, Oklahoma 74102-0871

Telephone: (918) 588-7761

Facsimile: (918) 732-1363

ADDRESS FOR COURIER DELIVERY:

MIDWESTERN GAS TRANSMISSION COMPANY

ONEOK Plaza

100 West 5th Street

Tulsa, Oklahoma 74103