Missouri Revised Statutes Title III. Legislative Branch § 21.350. Visual record board required

There shall be installed as a part of the mechanical equipment visual record boards, in positions in the house chamber that enable all members of the house, and persons present in the house galleries, to see how each member of the house voted on any question upon which the vote was taken by means of the mechanical equipment. The visual record boards shall show the name of each member of the house present and voting and how each member voted whether yea, nay or present.