Key chronology (sequence) runs something like this: First, there were no keys; then ELS with card keys; iron keys came next; mechanical keys followed; RFID (radio frequency identification) keys are on the horizon.

Question

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The sequence is incorrect. Mechanical keys have been used for centuries, long before the invention of electronic keys and RFID technology. The progression from mechanical keys to electronic systems and then to RFID is more accurate.

Key Chronology (Sequence) Runs Something Like This: First, There Were