18. In this Part —“key”, in relation to a lock, means a device or information normally used to operate the lock;
“lock” means a device for securing a door or window or other part of premises, and includes a lock in a master key system;
“master key system” means a set of locks in which —(a)
each lock or subset of locks has a unique key; and
(b)
one single key or master key can operate all the locks in the set.
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