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  • Variety of smoke detectors in an office cupboard.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 3 November 2009 Size: 1.8 MB Referencing Hub media

    Fire engineer Mike Spearpoint keeps smoke detectors in his office cupboards. He is testing the duration of the batteries. Some have lasted for 10–11 years.

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