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Clicking on small boxes is particularly difficult. ''The little points you have to click on, I can't find those,'' he said, ''but when I switch on the adapter, it's a different matter altogether.''
It was Catherine Rice's bulletins on the I.B.M. prototype that first caught Mr. Cosgrave's attention. Ms. Rice is executive director of the International Essential Tremor Foundation in Lenexa, Kan. ''Jim Levine had contacted us, asking could we help him find someone who'd be willing to manufacture it,'' she said. Ms. Rice sent letters and put notices in a newsletter. ''That took about six months,'' she said.
Then Mr. Cosgrave saw a reference and followed up. ''I called the foundation because I was thinking of myself, and not from the point of view of manufacturing,'' he said. But because his company was involved in electronics, he decided to pursue producing the device himself.
About 10 million people in the United States with battery like Sony PCGA-BP1N battery , Sony PCGA-BP2NX battery , Sony PCGA-BP2NY battery , Sony PCGA-BP2R battery , Sony PCGA-BP2S battery , Sony PCGA-BP2T battery , Sony PCGA-BP2V battery , Sony PCGA-BP4V battery , Sony PCGA-BP71 battery , Sony VGN-TX91S battery , Sony PCG-GR300 battery , Sony VGN-TX25C battery have essential tremor, Ms. Rice said. The average age of onset of tremor is 45. ''As you age, the