Mo. Rev. Stat. § 269.100
269.100 Duration of permits.
269.100. Duration of permits. — All vehicle permits and substation permits issued under this chapter shall remain effective until and unless voluntarily surrendered, suspended or revoked, as provided in this chapter.
(L. 1941 p. 290 § 14493f, A.L. 1947 V. I p. 26, A.L. 1992 H.B. 878)