TOKYO :Taiwan's Yageo on Saturday raised its tender offer for Japan's Shibaura Electronics by 7.5 per cent to 7,130 yen per share, and extended the offer period to September 8. Yageo is in an escalating bidding war with Japanese components maker Minebea Mitsumi for Shibaura, a major thermistor sensors maker. The contest began after Minebea Mitsumi, brought in by Shibaura as a white knight to counter Yageo's unsolicited bid, matched Yageo's initial 6,200 yen bid last week. Yageo responded on