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Master Key Systems

System & nbsp; with master key (MK)
It consists of a single group of cylinder locks in which each cylinder has its own key, different from the others and at the same time all cylinders can be opened with a single key, the "master key" (MK).
Application example:
hotel in which all the rooms have different keys but the doors can all be opened by a single key, the "master key" (MK).

General master key system (GMK)
It is constituted & nbsp; from & nbsp; more & nbsp; groups & nbsp; of & nbsp; master key systems (MK) which in turn can be opened with a single key, the "general master key" (GMK).
Application example:
Hotel & nbsp; in & nbsp; which & nbsp; all & nbsp; the & nbsp; rooms have & nbsp; keys & nbsp; different but the doors of each floor can be opened by a single key, the & nbsp; key & nbsp; teacher (MK) & nbsp; and & nbsp; all & nbsp; the & nbsp; rooms & nbsp; of & nbsp; all & nbsp; i & nbsp; plans & nbsp; from & nbsp; another & nbsp; key & nbsp; unique, & nbsp; the general master key (GMK).

System with central cylinder
It is constituted & nbsp; from a group of cylinder locks in which each lock has its own key, different from the others, but all keys can open common cylinders at the same time.
Application example:
Condominium in which the keys of each & nbsp; apartment, several & nbsp; between & nbsp; them, they can open & nbsp; also & nbsp; all & nbsp; the & nbsp; common doors (entrance, gate, services, etc.).

Mixed system
It is constituted & nbsp; from the & nbsp; combination & nbsp; of the three basic systems previously described. A & nbsp; system & nbsp; mixed with master key & nbsp; and & nbsp; cylinder & nbsp; central & nbsp; is composed of a series of cylinders such that they can all be opened by one or more master keys & nbsp; (MK) & nbsp; and & nbsp; from & nbsp; a & nbsp; eventual & nbsp; key & nbsp; teacher & nbsp; general & nbsp; (GMK) & nbsp; and whose keys also open one or more cylinders in common use.
Application example:
Hotel & nbsp; in & nbsp; which & nbsp; all & nbsp; the & nbsp; rooms have different keys but the doors on each floor can be opened by a single key, the & nbsp; key & nbsp; teacher (MK) & nbsp; and & nbsp; all & nbsp; the & nbsp; rooms & nbsp; of all & nbsp; the plans & nbsp; from another & nbsp; key & nbsp; unique, & nbsp; the & nbsp; general master key (GMK) and in which at the same time all the keys (different from each other) of each single room can open the same common cylinder lock (hotel entrance, garage, etc.).