Patent ID: 7484392

Claim:
A cylinder lock and key system comprising: a first key including; an elongated base having two opposite surfaces; a serrated wall extending from at least one of the surfaces of the base; a key groove formed by the serrated wall and extending in a longitudinal direction of the base; and a rib formed on at least one of the surfaces of the base and extending in the longitudinal direction of the base; a second key that differs from the first key, the second key including: a base shaped identically to that of the first key; and a serrated wall defining a key groove, the serrated wall and the key groove of the second key being shaped identically to the serrated wall and the key groove of the first key; and a rotatable rotor including: a keyway into which the first key and the second key are selectively insertable; a first cavity formed in the keyway and shaped to enable insertion of the base of the first key and the base of the second key; a second cavity formed in the keyway and shaped to enable insertion of the serrated wall of the first key and the serrated wall of the second key; and a third cavity formed in the keyway and shaped to enable insertion of the rib of the first key.