§ 71.04  OPERATING WITHOUT LICENSE PLATES.
   (A)   No person shall operate or cause to be operated upon a public road or highway a motor vehicle of a manufacturer or dealer unless the vehicle carries and displays a placard, except as provided in R.C. § 4503.21, issued by the Director of Public Safety that displays the registration number of its manufacturer or dealer.  ('69 Code, § 72.26)
   (B)   Whoever violates division (A) of this section is guilty of illegal operation of a manufacturer's or dealer's motor vehicle, a minor misdemeanor.
(R.C. § 4549.10)  Penalty, see § 70.99