Semi-auto carbine featuring walnut forearm, grips, stock and combination lock safety. Early Permissive Action Links could be as simple as a mechanical combination lock. Additionally UL-768 certifies the combination lock against tampering. It was possible to use force to punch the combination lock through the door. These were Florentine-type belts of imitation leather-covered plastic, fastened with a combination lock. It often has a key or a combination lock attached to it. The Chinese created the first word combination lock in the 13th Century. The Equestrian Campground is gated but does not have a combination lock. The Family and Group Campgrounds are gated and have a combination lock. New to the game is a three-digit "combination lock" feature. Bypass attacks involve physical manipulation of the bolt mechanism directly, bypassing the combination lock. In 1861, inventor Linus Yale Jr. introduced the modern combination lock. Gerolamo Cardano later described a combination lock in the 16th century. He invented a combination lock when he was 12 years old. Before, contestants manually changed the combination lock to the three colors on their cards.