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I am a mostly retired RN and current museum worker. A large ring-shaped
strong magnet is placed on the chest of a patient with a certain type of
pacemaker to switch the stimulating characteristics of the pacemaker. It
does not damage it or turn it off.  As someone pointed out, a simple warning
that magnets are in use should be sufficient.

Phil Edgerton, The Health Adventure, Asheville, NC

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