| CPC G07C 9/37 (2020.01) [G07C 9/00182 (2013.01)] | 20 Claims |

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1. An overlock configured to be positioned alongside of a primary lock and engage the primary lock, wherein the overlock comprises (a) an overlock body; and (b) an engagement structure positioned at least partially in the overlock body and configured to engage a locking mechanism of the primary lock, wherein the overlock has (i) a locked position in which the engagement structure maintains the primary lock in a locked position, and (ii) an unlocked position in which the engagement structure permits the primary lock to move to an open position, the locking mechanism of the primary lock includes a first sliding bar movable along a longitudinal axis of the first sliding bar between a first, unlocked position and a second, locked position, and the engagement structure of the overlock includes a second sliding bar movable along the longitudinal axis between the unlocked position and the locked position.
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