After each elector has been admitted to vote, his voter's certificate shall be inserted in the file or binder provided therefor by the county board, and known as the “Voting Check List,” and the said voter's certificate so bound shall constitute the official list of electors voting at such primary or election. All voter's certificates prepared by persons applying to vote whose applications to vote are refused by the election officer shall be carefully preserved and returned to the county board with the other papers.