Missouri Revised Statutes Title III. Legislative Branch § 21.340. Requirements for mechanical roll call

The mechanical equipment installed and used for the purpose of taking and recording the votes of the members of the house shall be so constructed as to employ and use a roll call sheet, arranged in four separate columns, and to show in the first column, by perforation opposite their respective names, the names of the members voting yea; in the second column, by perforation opposite their respective names, the names of the members voting nay; in the third column, by perforation opposite their respective names, the names of the members voting present; and in the fourth column, by perforation opposite their respective names, the names of the members absent, and to show a printed total of the number recorded, by perforation, in each of the columns. The mechanical equipment shall provide for the use of readily obtainable roll call sheets, and for the immediate substitution of the names of new members elected to fill vacancies in the original membership.