| http://www.w3.org/ns/prov#value | - More specifically, a sonic wave generation source 43 incorporated in the coordinate input pen 4 is driven by a pen power supply 45, a timer, an oscillation circuit, and a driving circuit 44 constituted by a control circuit which executes control by detecting a plurality of pieces of switch information of the coordinate input pen 4 and a memory which stores various kinds of data.
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