TOKYO (AP) - Sony closed the final chapter of its legendary battle with Victor Co. of Japan to dominate the home video machine market, when it announced Tuesday that it would discontinue its Betamax VCRs. Sony will stop manufacturing Betamax machines by year's end as the company refocuses its efforts on DVD and other technologies now dominating the market, Sony spokeswoman Shoko Yanagizawa said. The announcement marks the end of a 27-year run, during which the fabled brand sold 18 million units worldwide in a race against VHS technology from its archrival Victor Co., which is also known as JVC,...