Okla. Stat. tit. 59, § 59-1012: Necessity for licenses - Penalty

(a) Ninety (90) days from and after the effective date of this

act it shall be unlawful and a misdemeanor for any person to act as,

or perform the work of, a journeyman plumber, as defined in this

act, until such person has qualified and is licensed as a journeyman

plumber or plumbing contractor, as provided in this act.

(b) Ninety (90) days from and after the effective date of this

act it shall be unlawful and a misdemeanor for any person, firm,

partnership, association or corporation to act as a master plumber

or plumbing contractor or to engage in or offer to engage in, by

advertisement or otherwise, the business of plumbing, or plumbing

contractor, as defined in this act, until such person, or a bona

fide member of such partnership, or a bona fide officer of such

firm, association, or corporation, as the case may be, shall have

qualified and is licensed as a plumbing contractor as required by

this act.