ABSTRACT
According to Northern Virginia Lock and Security Systems, a lock is defined as “a device that incorporates a bolt, cam, shackle or switch to secure an object-such as a door, drawer or machine-to a closed, opened, locked, off or on position, and that provides a restricted means of releasing the object from that position” (personal communication with Eric Smith, owner of NoVA Lock and Security, June 2, 2011).
