Okla. Stat. tit. 52, § 52-24: Pipeline companies declared common carriers -

Discrimination - Exemptions.

Every corporation, joint stock company, limited copartnership,

partnership or other person, now or hereafter engaged in the

business of carrying or transporting natural gas for hire, for

compensation or otherwise, by pipeline, or pipelines within this

state, and by virtue of and in conformity to, any valid law

incapable of revocation by any law of this state or of the United

States, or by virtue of and in conformity to the provisions of this

act, shall be a common carrier thereof as at common law, and no such

common carrier shall allow or be guilty of any unjust or any

unlawful discrimination, directly or indirectly, in favor of the

carriage, transportation or delivery of any natural gas, offered to

it, in its possession or control, or in which it may be interested,

directly or indirectly, and provided further, that any person, firm

or corporation owning or operating a natural gas pipeline within the

limits of any incorporated city or town in this state shall be

exempted from the provisions of this section only as to its

distributing lines located wholly within the corporate limits of

said city or town; and provided further, that any person, firm or

corporation engaged in gathering natural gas in this state shall be

exempted from the provisions of this section as to such gathering

activities and instead shall be subject to the provisions of

Sections 2 and 3 of this act.