A mechanical logic component such as mixed two-position component, wheel type of two-position component, displacement type of protector or controller, logic operator, mixed two-position counter, multiple digital lock, selectable type of antiprizing lock and unlock-test proof lock can be developed to be mechanical burglar proof devices such as sequencing burglar proof device, secondary protective burglar proof device of automobile, double-door burglar proof device, double-lock and double-alarm burglar proof door and secondary burglar proof new product with unlock-test and destructive unlock function.