Abstract: A voting machine includes a band interlock system for limiting the number of selections made. A plurality of aligned moveable selector keys are provided with cam surfaces on each key shaft. A rotatable column locking mechanism is mounted adjacent each key having a pair of removeable pins, one pivotal about the other. A slide device connects each key with the adjacent locking mechanism to rotate the mechanism as the key is depressed. A metal interlock band is threaded between each pair of removeable pins of selected column locking mechanisms to interconnect the corresponding voting keys. The interlock band is secured between clamps with a predetermined amount of slack. As each selection is made, the locking mechanism corresponding to the voted selection key pivots to reduce the slack in the interlock band. After a certain number of selections, the slack in the interlock band has been eliminated and the band is taut against the selected locking mechanism so that additional mechanisms cannot be rotated.