Section 301.100 - Registration of motor vehicles operated for first time in state1. Motor vehicles not previously registered in Missouri and operated for the first time on the public highways of this state may be initially registered for less than a twelve-month period at the director's option, when in his judgment such fractional registration period shall tend to fulfill the purpose of the monthly series registration system.2. Upon expiration of the initial fractional registration periods, motor vehicles so registered shall thereafter be registered for twelve-month periods as provided in section 301.030.3. Application for registration of a motor vehicle not previously registered in Missouri, operated for the first time on the public highways of this state, and previously registered in another state shall be made within thirty days after the owner of such motor vehicle has become a resident of this state.L. 1947 V. I p. 380 § 8389b, A.L. 1951 p. 695, A.L. 1953 p. 567, A.L. 1983 H.B. 149, et al.