http://prodb.matsushita.co.jp/product/info.do?pg=04&hb=SV-AV50 http://panasonic.co.jp/corp/news/official.data/data.dir/jn030911-1/jn030911-1.html http://ascii24.com/news/i/hard/article/2003/09/11/645911-000.html?geta