Okla. Stat. tit. 52, § 52-21: Businesses and persons subject to act - Vested rights

excepted.

Every corporation, joint-stock company, limited copartnership,

partnership or other person, now, or hereafter exercising or

claiming the right to carry or transport natural gas by or through

pipeline or lines, for hire, compensation or otherwise, or now or

hereafter exercising or claiming the right to engage in the business

of producing, piping or transporting natural gas, or any other

person or persons, now or hereafter engaging in the business of

buying, selling in or transporting natural gas within the limits of

this state, shall not have or possess the right to conduct or engage

in said business or operations, in whole or in part, as above

described, or have or possess the right to locate, maintain, or

operate the necessary pipelines, fixtures and equipment thereto

belonging, or use in connection therewith, concerning the said

business of carrying or transporting natural gas as aforesaid, on,

over, along, across, through, in or under any present or future

highway, or part thereof, within the state, or to have or possess

the right of eminent domain, or any other right or rights,

concerning said business or operation, in whole or in part, except

as authorized by and subject to the provisions of this act, except,

further, and only such right or rights as may already exist which

are valid, vested, and incapable of revocation by any law of this

state or of the United States.