No employer in this state shall use any frac tanks with unprotected manways into which a person could fall. Laws 1981, c. 153, § 2.
Okla. Stat. tit. 17, § 55
Use of frac tanks with unprotected manways prohibited
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.