Okla. Stat. tit. 47, § 1-119
Flammable substance shall include any liquid, gas, or other material as defined in 49 C.F.R., Part 173.
Laws 1961, HB 556, p. 317, § 1-119, eff. September 1, 1961; Amended by Laws 2004, HB 2336, c. 390, § 3, emerg. eff. July 1, 2004 (superseded document available).