A defibrillator from the Harpenden Trust is still missing after several months.
The life-saving equipment was taken from the Southdown Road property between Christmas and January.
It was only installed last June after being bought by the Rotary Club.
Anyone who knows where it might be has been asked to ring the Trust centre on 01582 460457 and leave a message, or contact Community Heartbeat on 08458 627739.
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