| http://www.w3.org/ns/prov#value | - Referring now to the drawings and in particular to FIG. 1, the pacemaker comprises an energy source 10 for example a mercury-zinc or a lithium based cell, connected to a timing circuit 12 which is arranged to receive messages from a sensing circuit 14 and to deliver an output to an output circuit 16 which supplies electrical pulses selectively either to an atrial electrode 18 or to a ventricular e
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