50Hz or 60Hz?

<BODY> <A href="50or60_main.html" accesskey=C>To the Page of `50Hz or 60Hz?'<SPAN CLASS=U>C</SPAN></SMALL></A>) <ADDRESS> <A HREF="../index.html" TARGET="_top" ACCESSKEY=T><SPAN CLASS=U>T</SPAN>OP</A><IMG src="../spacer.gif" width=16 height=16 alt=""><A HREF="mailto:jiji@ictnet.ne.jp" ACCESSKEY=E><SPAN CLASS=U>E</SPAN>mail</A> to Kunihiko Nakano(c)  FEB 10, 2002  </ADDRESS> </BODY>