发明申请
摘要：
A briefcase includes at least one combination lock. The combination lock includes a group of at least three tumbler rings. Each tumbler ring is operable to rotate and to settle at one of multiple predetermined positions. Each tumbler ring has multiple labels thereon and each of the multiple labels corresponds to one of the multiple predetermined positions. In the combination lock, each tumbler ring has thereon a wild-card position-label and multiple alphabetical-letter position-labels. Each of the multiple alphabetical-letter position-labels is a single alphabetical-letter. The wild-card position-label is configured for representing any alphabetical-letters.